Making a guitar amp out of a 1948 recordio

[rumblebox]

It didnt work, so I'm using the vintage components to build an amp using a circuit similar to a fender champ.

BEFORE:

PROGRESS:

I have a long way to go, but it's a pretty simple circuit. The only part that confuses me is the million-wire transformer.

 

[crusty philtrum]

Re: Making a guitar amp out of a 1948 recordio

You can use a multimeter to work out which wires go together to form the different windings and their possible centre-taps. I assume you know which are the main input voltage wires. What i do is power the transformer from an AC plug pack or some kind of power AC supply that can provide a low voltage. I use a 5 Volt AC plugpack, which i clip onto the primary winding of the transformer. Then i measure and write down the voltages on the other windings.

Then you have to calculate the ratio between the low test voltage and your wall voltage. In my case, the wall voltage is 240 Volts, so I divide that by the 5 Volt test voltage. That gives me a figure of 48. So then it's simply a matter of multiplying all the voltage measurements I wrote down by 48, to find out what those windings will deliver when the primary winding is fed from the wall voltage.

The rectifier winding(s) will probably be big, solid-core wire that is quite stiff. But if there's more than one you need to know which voltage is for which valve (tube).

 

[rumblebox]

Re: Making a guitar amp out of a 1948 recordio

http://www.radiomuseum.org/r/wilcox_gay_7e40.html

 

[Rand-O-Monium]

Re: Making a guitar amp out of a 1948 recordio

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