Fast forward to a few months ago, I started a new project and so I pulled out the Vox I'd long since traded my Bassman for something or other in order to have a gigging amp. The diode rectified power supply also incorporated a special time delay switch called a surgistor. . The schematic for the amp indicates that the amp is properly biased when the pot is ajusted to provide -32 to -40 volts. This usually indicates who actually made the amplifier, Vox, that's just a trademark. Does it have six preamp tubes or five? Certain to become the definitive book on the subject, Vox Amplifiers also sets a new standard by which other books on the history of our most beloved gear might be judged. Ive seen pics with ones like this with no a vox product under the voltage selector and all have been ss rectified.
For any other locations, please send us an email for a quote! In these pages is a seemingly endless array of pictures detailing every aspect of Vox history, familiar and unfamiliar, along with an engrossing narrative and meticulous documentation. The SmallBox 50W guitar head features two footswitchable channels with separate gain and volume controls. I did notice on that red capacitor on the bottom left corner on the lower tag board has may 730 on it. The first thousand of these are numbered and signed by the author. Two controls would be mounted in a hole in the back panel and a reverb pan would be suspended from the bottom of the slider board. This tube rectified power supply exhibited a sag in voltage when driven hard. Woah, I totally forgot that Schroeder is in Chicago.
If your country isn't listed in the shipping section, please email your address and get a personal shipping quote within an hour! Leave it in the on position all the time. No use on online auctions, eBay or Reverb. The audio compression that is a natural byproduct of an amp with a tube rectified power supply is preferred by many guitarists. Diamond input amps - mid 1964 No Hunts date codes are visible in the pics gathered so far - generally speaking, bias caps are oriented so the Hunts name and value of the cap face out. Ditto for the crackling, which could very well be arching. A selection of values were bought in for the circuit, which required: four 25uf 25v for preamp valve cathode bypass; two 8uf 150v for the bias circuit; one 32uf 450v for preamp filtering along with two 16+16uf 450v; and two 32uf 500v as main power amp filters. I don't think you'll be disappointed in the amp once it's running right.
Not sure if those were stock tubes vox was using at some point. The solution is just not to use it. Note that the black-topped transformers are nos 66522, 66523 and 66524. I think as word spreads, more and more people will become excited about something I am very proud of. Direct In jacks and the reverb.
Additional venting was provided in the front grill cloth panel. Do you have any pictures to post? But one can sometimes see relevant date code letters peeping out. Does the tube rectification even look like Vox factory job, where they likely would have used the usual rectifier mounting hole, which they still left to amps that used silicon rectifiers. These are likely to be Vox part numbers rather than the manufacturer's. In 1963, the year before the Beatles invaded America,Vox started to investigate the development of high powered amplifier circuits. If anyone knows of others that have not yet been included, as ever. Vox decided that the major selling feature of these new amps should be their abundance of power, not the inclusion of effects or multiple channels.
The first channel is voiced like the classic Plexi amps of British fame. At best, I can get some distortion but it sounds really harsh. Manufacturer's part numbers - Mains transformer: 66522. There are instances, however, when the code appears to have been given in reverse order, the first letter being the year, and the second and third the week. The output tubes were mounted vertically to this steel chassis base, facilitating proper ventilation and providing an excellent heat sink for the tube sockets. Please contact me for further details. The proviso of course in all cases is that caps are original to the amp.
Thanks for any help dating this. Just a link does not help the cause. The original idea was to have a thirty-five-page field guide with seven or eight charts, some basic info, and photos of some of my collection. However I can find nothing online that identifies the date of manufacture from the serial 03435. Thanks to Gary for the pictures.
A speaker impedance selector allowed the choice between 8 or 16 ohm total speaker loads. The steel base section of the chassis provided the strength and rigidity to support the heavy power and output transformers. Everyone was very gracious about working their schedules around mine, and also in sharing their photos and other materials. Further reproduction or distribution of data, information and images downloaded from the Vox website is prohibited. © 1998 - 2019 The Vox Showroom and North Coast Music, all rights reserved The images and editorial content in this web site may not be copied or reproduced in online auction sites such as eBay, Reverb and Craig's List. The fact that it sounds bright and the channels are blending leads me to believe there's a phasing issue going on from some bad wiring in there. Knowing who owned the trademark at the time when the amp was built is already a head start in dating it to certain era.