A larger view of Dan's schematic seen below may be found here > Dan Steele ST-70 schematic
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DesignInc wrote:... and yes the rectifier tubes are burning.
Original Sylvania/USA 5AR4/GZ34 the original use is unknown and was replaced in
1/2020 Electron/China 5AR4 new in was replaced in
6/2020 Tung-Sol/Russian 5AR4 new
I was kind of bummed when the Sylvania went, a friend gave me the China fire cracker that lasted 1100 hours (55hrs/week) I'll be interested to see how long the better quality Russian Tung-Sol lasts.