I was thinking the last time I biased my 6545 with EL34s (25 watters), I biased at 35ma (65% is usually what I shoot for), but I'll check it out next time I get to our practice space where I keep my 6545.
I put a small sticker with date and measurements on the chassis every time I bias/retube. I do the same thing on the preamp tube retainers every time I test a preamp tube and use it in an amp. Maybe just me being anal-retentive, but it does let me know what I have in there at a glance.
I've run a couple of NOS Tung Sols in the 12AX7 slots before and they sounded great - not sure how they'd compare with the current production stuff.
Hey Paul. When I picked up my 6545 it had EH EL34's with a plate voltage of 432v and bias at 31ma. I'm using a GT 12ax7-M phase inverter (came with the amp, in fact all of the 12ax7's were GT 12AX7-M) and Groove Tube #7 EL34's. The plate voltage is 420v so I set the bias to 34ma using the voltage/current chart from the website below. Then if I recall tweaked to what I liked but can't remember where I set it.
GuitarZ: Ugh! Dropped small nut while installing new outside lamp. Thought I saw where it landed. Couldn't find it. Moved the car & such. Engineering mind said, drop another (after ~hour). Bang! Within 5 seconds. Nut found! Yea! Wife Impressed!
Apr 5, 2020 16:44:09 GMT -7
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roscoenyc: Truss rod, 1/4 turn at a time.
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GuitarZ: Best Pandemic Comment - Delivery guy shows up. As we're social distancing, I look at myself in brown loafers, black socks, gym shorts, t-shirt and say "I realize this is not my best look". His response "You can wear whatever you want to the apocalypse."
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