"The 6107 was a Webster made amp and many NDB amps earlier than 1935 were also made by Webster, sometimes with no logos attached. If we could find an archive of early Webster amps we might find your schematic...."
"Good deal Joseph, I just sent you an email addressing this and your other issues you mentioned and yes, 10K plates are correct. As I recall they are 7 or 10 watt resistors too in the stock circuit. Good job!"
"I looked through the schematics and didn't see where you are talking about and must have overlooked it. Email me at firstname.lastname@example.org and send along the schematic so I'll have what you're looking at. We'll post the reply here on…"
I don't have a schematic for this one but I have repaired a handful of these models and next one I get in I'll draw it up. Could be someone has modded the amp in a bad way and it would be very hard to guide you through a…"
The New Russian 6973's sonically are not as good as old stock. The 6CZ5 can be a good sounding substitute and are still relatively inexpensive. The 6ZC5 doesn't sound exactly like the 6973. They have a bit less headroom and…"
"Yeah, I have one myself. That is the Gretsch labeled version of the Supro 1605R amp. Same amp and circuit just with Gretsch appointments. I agree that it is one of the coolest sounding little Valco amps. Basically it is a Supro Supreme amp with…"
Thank you so much for your help! I will employ all suggestions. I'm blessed to be able to ask you for help, and I learn something from you every time I get in a jam. In the end, I hope I can tell you the one thing that made this noisy amp problem so bad. Until then, I have no one to blame but myself! Talk to you soon.
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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.