Valco Amp
The place to be when you've got a Valco, or just gotta get one!
1650T Brentwood - It lives Igor!
Hi Terry,
Finally I had time to finish off the Brentwood and get back to you.
Thanks for the Aztec circuit diagram, they are almost the same circuits. The Brentwood uses a 6AX5 rectifier whilst the Aztec appears to have a 5 series. I have amended the circuit diagram to reflect the diffrent rectifier and speaker configuration and added the resistor values for the inputs.
In the end I basically rebuilt the whole amp and learnt heaps in doing so. The speakers were shot so I found a pair of 6 x 9"s and built a new baffle for them, they sound great. I read a Tone Quest review that said that the magic is in the microphone channel - the instrument channel sounds pretty good to me as well! In some ways the mic channel is overgained and you really have to watch your input levels.
The one change I did make from the circuit was to remove the 250 pf capacitor at the input as this really dragged the signal down, admittedly it was the original cap and may have been faulty but I haven't missed it (yet).
Hope the circuit diagram and pictures come up okay.
Once again thank you for all your help on this, I doubt that I would have got through it all without it.
Cheers,
Mat
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History of Valco
The Valco company has its roots in the National String Instrument Corporation, which was founded in 1927. The company is famous as the first manufacturer of resonator guitars, which were hugely popular in blues and (a bit later) bluegrass music. National merged with the Dobro company, another maker of resonator guitars, around 1932 to form the National Dobro Corporation. The company began producing electric instruments in the 1930s that included electric guitars, lap steels, mandolins and amplifiers. These pre-war electric instruments are fairly rare today, though the lap steels pop up with some regularity. The archtop bodies for the guitars were sourced from Regal and then from Kay, but the electronics were developed and manufactured by National-Dobro. The Supro brand name was introduced in the mid-‘30s for cheaper electric instruments. Read More >
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