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Topics - SerpentRuss

Tubes and Hybrids / Help with Hybrid Design
December 09, 2020, 01:53:20 PM
Hey guys, new here.  I've been lurking for a few weeks and enjoying looking back through old posts hoping to gather some knowledge.   I started a project a couple of months ago and I have a couple of questions.

There is a seller on eBay that occasionally sells small tube guitar amplifiers housed in small, unique enclosures.   I have been outbid on the couple that I've tried to buy.  I look on eBay infrequently and he seems to offer amps on a rare basis.  I contacted him directly and asked him if he would sell me a kit and he was kind enough to reply with a schematic, but he wasn't interested in selling me a box of parts or supporting his design.  I get the feeling that he makes each amp a bit differently.

The power supply for the amp I'm trying to build features an inexpensive 7-volt Antec Toroid transformer with the 120-volt coils split, making it a small isolation transformer.  The 7-volt side is used for the tube filament.  The output transformer is a cheap 70-volt distribution transformer. The output is supposed to be in a 1/2 watt range.  I have sourced all the parts and have started working.  I think I have about 30 dollars in the parts.

If I was going to insert a tone stack in this circuit in the solid-state pre-amp, where would it go?  I'm thinking it would insert prior to the gate of the third LND150.  Also, the quality of the schematic jpeg is pretty bad.  I've assumed the gaps in some values are missing decimal points.  For example, this would make the cap in series with the volume pot 4.7N.  Does that seem right?