Vox AC80/100 (early AC100) serial number 173


2017




22th September

Two AC100s from 1966 added - and .

The former has two Hunts caps with visible date codes:

The leftmost reads "UYT" and the one in the centre of the picture "IUS". Using the "WHITSUNDAY" formula outlined below (entry for 14th September), we get: "604" and "365". The cap. on the left has year first, then week = 4th week of 1966. The one in the middle has week first, then year = 36th week of 1965.

20th September

Great shot of the Beatles on stage, Stockholm, 28 July 1964 . Colour has been corrected.

18th September

"Blind Pew and the Sights" at the King's Hall, Ilkley, 1964 or 1965, with an AC100 and two T60 cabs.

17th September

Rolling Stones, Olympia Theatre, Paris 1964 with an early Vox AC100 SDL

A new page with pictures of bands aside from The Beatles with early Vox AC80/100 SDLs - posted here.

16th September

Over the next fortnight, pages across the site will be updated and tidied up. None should be inaccessible. The bands A-Z and bass and guitar cab pages have already been done.

The Beatles at the Hollywood Bowl in August 1964. The image has been lightened to help bring out the fourth (spare) AC80/100 lurking in the gloom behind Paul's spare Hofner bass. Click as ever for a larger copy - it should occupy the full width of most monitors.

15th September

A late 1950s or early 1960s album of Goodmans stickers and labels is now available here.

It encompasses a number of labels (and box stickers) for speakers that Vox bought in from Goodmans early on. Perhaps the only one relevant to the AC100 (and AC50) is the Audiom 90 - 50 watts, 15 ohms - which went into the earliest Foundation Bass cabinets.

A Foundation Bass cab belonging to AC50 serial number 3490 from 1965 with an Audiom 90 in place. But the speaker may be a later substitution for a Goodmans Audiom 91.

14th September

Date codes on Hunts capacitors

Above, a Hunts filter cap from AC50 serial number 1034B (further pics on ). Its twin is still in place in the amp. The date code is the three letters: "YIW".

The key to the Hunts code was worked out some years ago on a British valve radio forum with the help of a former Hunts employee.

The system is based on the word "WHITSUNDAY", chosen because it has ten letters, none of which are duplicate. W = 1, H = 2, I = 3, T = 4 and so on, through to Y = 0.

To decipher "YIW": the first two letters give the week of the year, in this case 03, ie. the 3rd week. The third letter gives the last digit of the year of manufacture, in this case "1" = 1961.

Later on, however, the code regularly appears to have been given in reverse order, the first letter being the year, and the second and third the week. This is certainly how it appears on caps in AC100s with serial numbers in the 1900s:

Above, a detail from AC100 serial number 1905. Click for a larger image.

The Hunts code in the pic above is "UYT" = 604 = the 4th week of 1966. Other amps with serial numbers in the 1900s have "UYT" too.

Details of codes on Hunts caps in serial nos 1579 and 1584 will be give shortly.

9th September

A page of pics of the J200 now posted here. These will be added to soon with details of the preamp and power transistors.

A small clutch of new AC100s to come.

23rd August

Quick shots of Jennings J200 serial number 1018, which spent a good part of its working life in Bern - it has Musik Muller stickers, front and back. The latest component date codes immediately visible are on two of the RCA transistors - "0F" = June 1970, so the amp was probably assembled late in that year. Detailed pics will be posted soon.

18th August

A new page begun on Jennings (JEI) reverbs. Early ones are extremely scarce. Later (purple) ones are known, however.

15th August

If anybody has, or has seen, a new-style JEI B50 or B100 as in the pic above do let me know. The shot is also on the page posted yesterday.

14th August

A new page begun on Jennings Electronic Industries in 1973.

12th August

A new page posted on the JEI B100 and O100. The two amps had the same power amp as the PA100. The B50, O50 and PA50 also had a power section - 40 watts in this case - in common. One often finds the output of these last given as 50 watts, but that was simply marketing puff. 50 watts was not attainable in an audio amplifier application from two 2N3054s.

The JEI pages will be moved to a site of their own in due course.

11th August (2)

A new page on component date codes in Jennings Electronic Industries amps now posted here.

11th August

The process of sorting out the Jennings Electronic Industries pages continues. Three new ones:

Jennings O50 serial number 306

Jennings O50 serial number 352

Jennings PA100 serial number 1045

24th July

Advert from Beat Instrumental magazine, August 1973, for the new style JEI V100, as below. At the Associated Musical Instrument Industries fair, the new line - with brown or woven grille cloth - was unveiled. "JEI" had already become the logo in late 1972.

16th July (2)

A new page now on the Jennings RT10 rotary speaker unit - designed primarily for studio use. 20w power handling (in two 10" Celestion speakers).

16th July

The page on the JEI V30 has been tidied up.

15th July (2)

A new page has also been created on the all-valve purple Jennings V100, produced from 1973-1975.

All new pages are registered on the main Jennings Electronic Industries index page.

15th July

There is a new page now on the all-valve Jennings AC100, produced for JEI by Triumph Electronics, and new to the range in late 1972.

14th July

New pics of the Jennings Electronic Industries pricelist from 1972 have been put up here.

12th July

The page on Triumph Electronics has been tidied up. Further info will be added soon.

A new page (which will be one of several) has been started on adverts placed by Triumph in Beat Instrumental magazine, 1967-1972.

10th July

The pages on Jennings Electronic Industries amplifiers and speaker cabinets are in the process of being updated.

Additions are now linked up on the index page: adverts and extracts from Beat Instrumental magazine, the J100 combo, the J200, the JEI AC15 and new info on the JEI AC40.

Further additions to come.

9th July (2)

The pages on JEI 1968-1971 are now on this site:

The pages on JEI 1968-1971 are now on this site:

JEI adverts and articles 1968 - 1969.

JEI adverts and articles 1970 - 1971.

9th July

A new page on Jennings Electronic Industries in 1972, principally from material published in "Beat Instrumental" magazine - adverts, short notices, previews and so on. Pages for 1970 and 1971 will be incorporated shortly.

2nd July

A set of new pictures of serial number 1903 now posted here. Thanks to Vincent.

1st July

The page on the Jennings AC40 has been updated, and a new page created for the solid state Jennings J40.

Over the next fortnight, other Jennings Electronic Industries pages will be updated. A body of documentation has been assembled in preparation on the Vox Supreme website.

Jennings Electronic Industries 1968-1969.

Jennings Electronic Industries 1970-1971.

11th June

A 100W Amplifier currently in Italy has been registered here.

A new page begun on Vox amplifier covers 1964-1967, gathering together info posted at various points on this site.

11th June

A new 100W Amplifier has come to light - serial number 682. Thanks to Csaba for the pictures.

29th May (2)

Vox AC100 serial number 496
Vox AC100 serial number 496

A further Vox "100W Amplifier" has come to light, one of the few amps surviving with a serial number in the 400s - no. 496.

29th May

Rudall, Carte and Co. advert for a Vox AC80/100, May 1965

Rudall, Carte and Co. advert in "Crescendo" Jazz Magazine for a "Vox 80 Watt Bass Amp", perhaps an old one, for £100.0.0 - in today's money £1750.

The list price of a new AC100 - a Mark 2 - in Nov. '65 was £105.0.0.

Advert placed by Jennings Musical Industries in "Crescendo" magazine, September 1963.

Notice in "Crescendo", January 1964. Reg Clarke stayed on as Sales Manager into the "Vox Sound Equipment Limited" period (1968-1969).

23rd April (2)

Pics of a Triumph-made AC100 paired with a JMI Supreme cab added on this page. Thanks to Magnus.

23rd April

New pics of a Vox PA50, or to give it its correct designation, MC50 mark 3 posted on this page. Thanks to Will.

10th April

Pics of serial no. 1580, in excellent original condition, added here. Thanks to Mike.

12th March

Working on the Vox Supreme website at the mo. A series of AC100 updates to appear soon though.

25th February

Some observations on Jennings Electronic Industries items (1968 - 1975). For the main pages on JEI amps and cabs, click here.


Jennings Electronic Industries B3 bass cabinet
Jennings Electronic Industries B3 bass cabinet

Jennings Electronic Industries B3 bass cabinet
Jennings Electronic Industries B3 bass cabinet

Above, two Jennings B3 bass cabinets - 50W handling. Both have 8ohm Goodmans Audiom 15" speakers (red label). Serial no. 263 has rounded corners, the old style logo, and reddish cloth. Serial no. 290 has squared corners, the new-style logo, and brownish cloth.


Jennings Electronic Industries pricelist 1972

The JEI price-list of 1972 shows that the B3 cabinet cost £71.00. Click as ever for a larger image. The Bank of England inflation calculator indicates that this would be equivalent to around £860 today - not a small amount.



Jennings Electronic Industries J40 amplifier
Jennings Electronic Industries J40 amplifier

Above, the JEI J40 combo amplifier (the solid state version of the JEI AC40). Note the solid back panel with cutout - much as the back panels of the Beatles' AC50 cabs that Dick Denney had helped design some eight or nine years earlier.






21st February

Pics of the sympathetic restoration of serial no. 1857 posted here. Thanks to Aart.





18th February

Further pics of serial number 424, a late cathode biased amp, added here.

Vintage Vox cable
Vintage Vox cable
Vintage Vox cable
Vintage Vox cable
Vintage Vox cable
Vintage Vox cable

More on cables - above, most likely a speaker cable for a Vox Conqueror (ie. between amp and cab), missing one end. The type of wire is the same as that used for AC30 footswitches and the signal feeds inside AC100s.

13th February

The Swingin Sting Rays with Vox gear

Couldn't resist popping this up straight away. The Swingin Sting Rays with an array of Vox gear in 1965: two large box Foundation Bass sets (the cabs with roller trolleys), an AC100, a pair of LS40 speakers, and a Vox Phantom guitar. The other guitar is a Burns bison. Pic from this page.

12th February (2)

Logo from a Vox AC50 cover
Logo from a Vox AC50 cover
Logo from a Vox AC50 cover

Logos from three Vox AC50 covers from different eras. Left: c. 1965; centre: c. 1967; right: probably VSEL or VSL. Pictures of the handle trims to follow. The first has maroon leather; the second, tan leather; and the last, none. The 1967 cover has thin vinyl, typical of the covers for solid state amps. The VSEL or VSL is much thicker and of a different type.

12th February (1)

AC30 from 1964 with original covers
AC30 from 1964 with original covers
AC30 from 1964 with original covers
AC30 from 1964 with original covers

Above, an AC30 from mid 1964 - copper panel and silver Celestion T1088s, so certainly after May 1964, and in view of the basketweave tolex (rather than smooth charcoal), likely to be summer 1964. Original chocolate brown plasti-leather cover shown in the second picture.

Chocolate brown covers also survive for an AC80/100; an AC50 mark 1; and PA columns (LS40). Towards the end of 1964, covers became uniformly black. Most had VOX logos. However, it is clear from survivals and early photos (of The Who at Richmond) that some black AC100 covers were issued without.

11th February (5)

Vox Echo SV
Vox Echo SV
Vox Echo SV
Vox Echo SV
Vox Echo SV
Vox Echo SV
Vox Echo SV
Vox Echo SV
Vox Echo SV

A Vox Echo SV, sold on ebay towards the end of 2016. These were assembled by Triumph for Vox from 1966-1967 (and appear in the catalogues of those years). The styling matched the PA ("mixer") amps in the same range.

11th February (4)

AC100 serial number 586
AC100 serial number 586
AC100 serial number 586

This AC100, recently on sale, is a composite. The box, with serial number 586 on its back, came from one source. The amp chassis, a "100W Amplifier" (chassis no. in the 1400s) came from another. The black panel was apparently bought on ebay and added later. The original grey panel is in the UK. Cab and trolley are repros. Earlier pictures of the amp are here.

11th February (3)

AC100 serial number 1540
AC100 serial number 1540
AC100 serial number 1540

Serial number 1540, also on the market currently. Assembled for Vox by Triumph Electronics, so the number doesn't mean that much - but a nice amp, currently in Germany. The typical unpainted transformers used by Triumph are visible in the second pic. above. The runners in the wooden case have been repaired. Older pictures of the amp are here.

11th February (2)

AC100 serial number 785 AC100 serial number 785

Serial number 785 - possibly 785 at any rate - is up for sale. The serial number plate is a repro, but may (though there is no guarantee of course) simply replicate the original. The speaker cab has new grille cloth; the trolley is from an American Super Beatle. The rectangular Cannon XLR connector may have been renewed, but an identical one must have preceeded it, as there are no stray holes for a round Amphenol. Round Amphenols had come in, where cabs are concerned, by serial no. 800. See the entry below for 5th Feb.

11th February (1)

The server went down for a few days earlier this week, but everything should be back to normal now.

5th February (2)

A brief return to early Vox plasti-leather covers, the two below for T60 amps: one in maroon, the other, needing some restitching, in racing green.

vintage vox T60 amp cover, maroon
vintage vox T60 amp cover, maroon
vintage vox T60 amp cover, racing green

Coloured covers for T60 cabs have yet to come to light. We do however have one in brown for the 2 x 15" cab that accompanies AC80/100 number 177.

5th February (1)

Further notes:

(1) Both cab and amp of AC100 serial number 800 have Amphenol connectors.

AC100 serial number 800 AC100 serial number 800

This therefore provides a useful terminus ante quem for stray cabs with a rectangular Cannon XLR.


(2) Only a handful of amps survive with the original factory-fitted cable running from the output terminal block to the XLR on the backboard. Below, serial number 392.

AC100 serial number 392 AC100 serial number 392

The cable (as fitted at the Burndept works) is screened single core (steel), 1/8 inch diameter. Lengths were also used for the feed from the preamp to the power valves (in the second picture, one can see the twin feeds passing through the grommeted hole by the capacitor), and for AC30 footswitches. Techs, presumably throwing up their hands at the apparent flimsiness of it, seem to have replaced the backboard cable in most amps.

It's worth noting that Vox, being Vox, made the original cable extremely short - 7 1/2 inches long. The mains feed into the amp from the backboard socket was similarly short too, giving extremely restricted play to the backboard when unscrewed.

4th February (2)

A couple of notes. First, serial number 289 has been reported as having a grey control panel. Interesting if true, as the panels of serial numbers 276 (hand-stamped plate) and 306 (machine-stamped) are black. But the amp could have been made by Triumph - and Triumph used serial number plates in a completely random fashion. The type of plate - hand-stamped or machine-stamped - has still to be determined.

Second, two largish gaps remain in the sequence of known amps at the moment: 430-501, and numbers in the 600s. This could just be accident - a result of the sometimes piecemeal way in which info comes to light. But simply to float the question: were some of those amps reserved by JMI / Vox for loan?

4th February (1)

A couple of new amps to signal - serial number 424, mentioned yesterday, and serial number 2134, the highest serial number definitely known:

AC100 serial number 424

AC100 serial number 424

Above, serial number 424, a late cathode biased amp produced for Vox at the Burndept factory, mid 1965. The amp was mentioned on several VoxTalks threads in the 2000s, but sank out of sight.

AC100 serial number 2134

AC100 serial number 2134

The lowest two panels are perfectly readable, even though the image has been expanded beyond its natural size. Serial no. is 02134, and the Rating: 319. Note the double pin corner protectors.

3rd February

Below, the chassis numbers of two late cathode biased AC100s, restamped at Burndept. The amps in question are serial nos 424 and 430.

AC100 serial number 424

Originally 1027, changed to 1130

AC100 serial number 430

Originally 1044?, changed to 1135


Perhaps at serial no. 400 someone decided to start chassis numbers off at 1100. Alternatively, the person in charge of the stamping machine may have got things wrong. The lowest chassis number to have come to light so far in a fixed bias amp is 11xx, the last two numbers unfortunately illegible.

29th January

Beatles, Milan, 24 June 1965

A better picture of the backs of the Beatles' speaker cabs from Milan, 24th June 1965. What seems to have happened is that the cabs issued in August 1964 were refurbished (new logos at the very least) and provided with new chrome trolleys.

The last time the old trolleys were seen in public was at the NME Pollwinners concert, Wembley, 11th April, 1965.

NME Pollwinners, April 1965

Part of Peter Noone of Herman's Hermits standing in front of one of the Beatles' cabs with an AC50 on top. Note the basket top to the trolley and the narrowness of the parallel side bars.

28th January (2)

The Beatles, Shea Stadium

A long shot from back of stage at Shea. In view is the amp used by John - the early thin-edged AC80/100 originally issued to Paul, and one of the speaker cabs from August 1964. Note that the speaker connector is on the lowest back board, rather than in the centre, which was the norm in standard production cabs.


The Beatles, Shea Stadium

Click for a larger image. A great grab from the restored film of the sound engineers at Shea.

28th January (1)

Jack Bruce and Graham Bond with an AC100 and two cabs

Jack Bruce with Graham Bond playing through an AC100 and two 2x15" cabs, c. 1966. Picture from this site. Photographer: John McCoy.


"The Blue Rockets", a band from Eygelshoven in the Netherlands, with an AC100 SDL behind.

17th January

The Stones at the Playhouse Theatre, 31 October, 1964

The pic above, posted a little way below a few days ago, shows Bill Wyman with the AC80/100 he is first seen with in April 1964. The photographer, Stanley Bielecki, is clear that it was taken at the Playhouse Theatre - and it certainly was as pics of the Beatles taken there show. The Stones rehearsed at the Playhouse in preparation for their BBC World Service broadcast on 31st October 1964.

The amp was evidently still going strong six months after Bill received it.

15th January (3)

Below, two screengrabs from the documentary on Screaming Lord Sutch and the Savages, made in early 1965 - scenes shot at the Lotus Ballroom, Forest Gate, London, September 1964.

Screaming Lord Sutch and the Savages with an AC80/100

Screaming Lord Sutch and the Savages with an AC80/100

A thin-edged AC80/100 and early bass cab with perspex logo. Note that the bassist is plugged into the second (the low) input, as Paul McCartney did too. The film as a whole is available on the BBC website.. Further grabs will be set up on a separate page.

15th January (2)

Just for interest, inverted details from the largest available image of the backs of the Beatles' amps, Finsbury Park, Astoria, Christmas Show rehearsals - late December 1964.


The Beatles' first AC80/100 in December 1964

Above, Paul's old amp (his first AC80/100) reboxed in a new thin-edged box, but used by George in this instance. Note the 8-line serial number plate. The amp sits in the basket top of one of the old SDL trolleys.


The Beatles'Christmas Show, 1964

A newer amp used for the show by Paul - still cathode biased, thick edged box with no corner protectors. The serial number plate has 9 lines of text.

15th January (1)

Bill Wyman at the BBC, mid 1964

Bill with his small-box thick-edged AC50 and Foundation Bass cab at the BBC probably in the second half of 1964. Note the AC30 to left. Bill generally used an AC50 at smaller gigs/venues, and for recording. His first AC50, seen in April 1964, was in a thin-edged box.


The Stones at the Playhouse Theatre, October 1964

The Stones rehearsing in October 1964. Note that one can just see the back of Bill's AC80/100 at left - two circular Cannon speaker output sockets one above the other. For more on this amp, see this page.

14th January

Sounds Incorporated at Wembley, November 1964

Sounds Incorporated on stage at the Empire Pool, Wembley, 20th Nov. 1964 - the "Glad Rag Ball" organised by London University. A pic. of Gene Vincent and the Londoners from the day is posted lower down on this page. Just visible behind Sounds Incorporated are the early AC100 SDL, the large-box AC50, and the AC80/100 on the drum riser.


The Stones at the Olympia Theatre, Paris, October 1964

A great pic from Getty Images of the Rolling Stones on stage at the Olympia Theatre, Paris, 20th October, 1964.


The Stones at the Olympia Theatre, Paris, October 1964

Picture taken by Roger Kasparian at the Olympia - the connectors on the back panel of the AC80/100 are just visible. Click for a slightly lightened copy of the image.


The Stones at the ABC Cinema, Chester, September 1964

The Stones at the ABC Cinema, Chester, 14th September 1964. Bill's two Foundation Bass cabs are at the near and far sides of the stage, the AC80/100 on the far one, largely obscured by Mick Jagger. The AC80/100 and cab immediately to our left of the drums presumably belonged to Inez and Charlie Foxx's band, also on the bill, and regular Vox users.

8th January

The Move at the Marquee Club, 1966

A great composite of The Move at The Marquee Club in 1966 giving something the chop. At least three AC100s are on stage.



3rd January

The Yardbirds with AC100s, 1966

A new picture page on the Yardbirds in "Blowup" now available here. The section was filmed at Elstree, the set replicating the Rikki Tick Club in Windsor. The band had three "100W Amplifiers" and a selection of cabs, presumably provided for the occasion by JMI. The blue hangtag of one of the 2 x 15s can be seen fleetingly.