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Hey Guys, At what sould I set the bias on the 6CA7EH (new) quad of outpur tubes? I have the VTA-70 "low gain board" AND when rolling the driver tubes, do I need to re-bias the output tubes each time I swap a 12AU7 etc...? Thanks, Ron
My rebuilt ST70s.
Today I lost Spike, my 7 year old male Albino Bristlenose, to bloat. He was a gentle giant and a friend. To upset to write more. RIP Spike.
I just replaced the 20 year old Sovtek 6550 WA's in my rebuilt SOS (sort of stock) MK III's with a set of Electro Harmonix KT88's. By sort of stock I mean the circuit is stock, but the first two capacitor sections in the power supply are handled by
Did a search on the forum and found ONE post on the KT90 ... that left me wondering about the tubes and whether they'd work in these amps. My understanding is they have more of an EL34 "mellow" sound to them than most KT88's. Also that the EH brand
You'll notice that I said "for me". That would be with my preamp (McIntosh C32) and my speakers (DIY Cornscalas). The tubes are (1) a Psvane 12AU7 in the center (phase splitter) position, (2) a pair of Electro Harmonix 12BH7s (gold pin) in the voltage