Aug 17, 2021
Shuguang Vacuum Tube 6CA7 replace EL34B #iwistao #shuguangtube #vacuumtube #el34tube #6ca7 https://www.instagram.com/p/CSqNmUjJA6S/?utm_medium=tumblr
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Shuguang Vacuum Tube 6CA7 replace EL34B #iwistao #shuguangtube #vacuumtube #el34tube #6ca7 https://www.instagram.com/p/CSqNmUjJA6S/?utm_medium=tumblr
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Cathode biased EL34 amp awaiting a head box to call home. Puts out about 30 watts of aggressive, crunchy power. Features all vintage iron - Stancor P-8356 power transformer, Northlake 35 watt output transformer and Thordarson T57C54 choke. Single channel, volume/tone controls, pilot light and power switch. No standby as it uses a 5AR4/GZ34 rectifier which has a slow warm up time which serves the same purpose. Yugoslavian Ei 6CA7 output tubes, 6SL7 phase inverter and 6SJ7 pentode input tube. 4/8 ohm speaker jacks. What a beast!
1968 Traynor YBA-1 in for a tuneup
Replaced 2-prong cord (with 3 prong plug electrical taped onto it!)
Unwired ground switch (left intact)
Soldered ground to chassis (these chassis are so heavy my 40W iron wouldn't cut it so I had to resort to the propane torch!)
Replace 4M (!!) volume pots with 1M
Replace treble bleed cap with 100pF (from 1nF)
Full cap job going with F&T dual 50uf 500V Cans except 10@100V for the bias (up from 8@250V - what was up with that anyway??? Most times these were grossly under spec for voltage.)
Added a 220K bleeder resistor
Replaced 39k resistor with 10K in series with a 100K pot for variable fixed bias
Polished and retentioned input and speaker jacks
Cleaned pots and tube socket pins
Nice big American made Sylvania 6CA7s!
Clean and lots of room for the new caps to go in
And here's the finished cap job
Finally got to drop in the nos Sylvania 6CA7 power tubes I picked up for the Traynor (YBA-1) last week. These tubes are massive, they make the old EL34's I had in there look like toys. They sound incredibly full yet deliver wicked glassy cleans. I snuck in a nos JAN GE 5751 in a preamp slot as well. I'm in love with my Traynor again! Can't wait to start playing it out of six 12" speakers.
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