We are working with a few builders and as we do, we are clarifying our instructions. We did find that depending on the wiring of the build, at extremes of tone and volume controls, some feedback / oscillation / distortion occurred. These mods are intended to eliminate most, if not all, of that.
The latest Layout v17 is here:
Attachment:
TripTop Layout v17.pdf [1.16 MiB]
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Important Note: Ensure Output Transformer Secondary wires are routed far from the input to V1 & V2Attachment:
OTwiring.JPG [ 85.92 KiB | Viewed 13614 times ]
Recommended after confirming Amp is Built as per latest Layout 171 560K PI grid resistor V3, pin 4
1 50p plate cap V3, pin 4-5 (or from .022uf to plate as in the picture)
Attachment:
PIgrid.JPG [ 39.55 KiB | Viewed 13614 times ]
Use Aluminum tape to tape down OT Primary & Secondary leads in place on chassis as per layout 17
Optional as required2 470K PI mix-grid resistors from both channels to V3, pin 1. Replace 270K.
2 220K plate resistors reduce gain of normal channel V2 pin2 & pin 5 (replace 470K on board)
1 1K across (in parallel with) 120K tone stack resistor to lower top end boost of tone stack