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Solid State Guitar Amp Forum | DIY Guitar Amplifiers

Solid State Amplifiers => The Newcomer's Forum => Topic started by: Farthing on September 17, 2011, 05:42:17 AM

Title: TRANSFORMERS
Post by: Farthing on September 17, 2011, 05:42:17 AM
 I need a replacement transformer for a Vox hybrid amp(non-modelling). it has 4 output leads plus earth. I should point out that UK Vox distributor KORG cannot supply such a thing
The top is marked 066-CVE GT 0006. Whether that means anything-i dont know. the amp curcuit is regulated by a ST electronics TAD2050 chip with an output rating of 32watts.

Is a transformer like that available to buy or would it have to be re-wound?
Title: Re: TRANSFORMERS
Post by: joecool85 on September 17, 2011, 08:25:10 AM
Quote from: Farthing on September 17, 2011, 05:42:17 AM
I need a replacement transformer for a Vox hybrid amp(non-modelling). it has 4 output leads plus earth. I should point out that UK Vox distributor KORG cannot supply such a thing
The top is marked 066-CVE GT 0006. Whether that means anything-i dont know. the amp curcuit is regulated by a ST electronics TAD2050 chip with an output rating of 32watts.

Is a transformer like that available to buy or would it have to be re-wound?

You'd have to find out the output voltages but you should be able to buy something that would work.
Title: Re: TRANSFORMERS
Post by: J M Fahey on September 17, 2011, 03:21:53 PM
Hand draw the PSU schematic, meaning at least the actual transformer (indicating wire colors) , the diode bridge rectifiers and the first filtering caps.
Also whether the lower voltage supply uses voltage regulators or not.
This will help in guessing correctly needed voltages.
Title: Re: TRANSFORMERS
Post by: Farthing on September 19, 2011, 06:09:05 AM
how do you find out output voltages? the curcuit has a valve driven overdrive-like the old valvestate
Title: Re: TRANSFORMERS
Post by: teemuk on September 19, 2011, 06:14:53 AM
What amp is it?
Title: Re: TRANSFORMERS
Post by: Enzo on September 20, 2011, 06:28:38 AM
And are you telling us the distributor cannot provide the part because they do not have them, or because they won;t sell the parts to anyone but their authorized service centers?
Title: Re: TRANSFORMERS
Post by: Farthing on September 20, 2011, 08:17:01 AM
The amp is a Vox Cambridge 30r. Discontinued in 2005, these were similar to the Marshall valvestate in that they had one ECC83 tube in the overdrive section.

Because it is discontinued they no longer supply parts for this model bar two curcuit components. There is no curcuit schematic available either. The voltage is stepped down and then fed through to a TDA 2050 IC which works on about 25volts. It's possible they never had a transformer for this from the start.Farthing
England
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