This Spare Time Gizmo cct. brd. only cost $AU16 and is double sided, screen printed and solder masked. I used it in both 6T9 amps. The components are quality without getting into exotica were available form my local electronics hobby shop. The coupling and input caps I increased to .22uf metallised polypropylene types and the final PS cap I doubled in capacity. Snubbing was added to the diodes and the PS caps. Edcor SE OPTs (XSE15-8-5K) were used and the UL tap wired to pin 10 of the valve sockets. The screen grid resistor left out. The power tranny is Hammond and I went slightly over-size. This is an excellent sounding amp and I would recommend it to any builder of audio gear wanting to try valve amp construction.
Sunday, September 28, 2008
SE 6T9 UL amp curcuit board
This Spare Time Gizmo cct. brd. only cost $AU16 and is double sided, screen printed and solder masked. I used it in both 6T9 amps. The components are quality without getting into exotica were available form my local electronics hobby shop. The coupling and input caps I increased to .22uf metallised polypropylene types and the final PS cap I doubled in capacity. Snubbing was added to the diodes and the PS caps. Edcor SE OPTs (XSE15-8-5K) were used and the UL tap wired to pin 10 of the valve sockets. The screen grid resistor left out. The power tranny is Hammond and I went slightly over-size. This is an excellent sounding amp and I would recommend it to any builder of audio gear wanting to try valve amp construction.
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Here's my 6T9 project... https://galimaufrey.blogspot.co.uk/2016/11/6t9-valve-audio-amplifier.html
Julian.
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