The purpose of this Sticky Thread is to list these mods, and link to these threads and other sources, but pull the most important info Pics, Layouts, schematics, parts, and how to info to the front so it's at your fingertips here. The point won't be to discuss anything here, because the meat and potatoes of the subject will be lost in the pages of replies, thus defeating the purpose.
If you want to see the discussion, the link to the related thread If applicable will be listed in this summary for quick access. I think a thread like this is long overdue, and I hope it really helps builders find what they are looking for. Your help is more than welcome. It's encouraged Just PM me if you have something cool to add.
Except by flemingmras » Wed Sep 23, pm Just so you understand how things work in a preamp Dropping the value of the cathode resistor i. You can also increase gain by raising the value of the plate resistor i. If you have issues with high frequency oscillation, there are a couple of ways of taming that.
You can place a 47pF or some other low value cap across pins 1 and 3 or 6 and 8 depending on which side of the tube it's coming from on the stage that you're adding gain to. Placing this cap across the plate resistor should do the same thing.
Because it's such a low value, it shouldn't have any noticeable affect on your highs. On the Super Lead circuit, V1's gain stages are mixed together via the mixer resistors K Instead of mixing them, you can cascade them for more gain. What we are going to do is change 1 capacitor to a.
The calculated value from this change will be 1. Post by Tinners » Tue Mar 21, pm. Post by danman » Wed Mar 22, pm. Post by neikeel » Wed Mar 22, pm. Post by danman » Thu Mar 23, pm. Post by Gorilla72 » Thu Dec 19, am. Post by danman » Sat Dec 21, pm. Metropoulos Forum The place for vintage amp discussion.
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It may not display this or other websites correctly. You should upgrade or use an alternative browser. Anyone have a good schematic for gain stage for a jcm? I think i am done tinkering with my Traynor.. I have another project PTP style amp about to take a turn on my work bench. I know there is more than enough gain you can coax out of a preamp circuit.
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