Bottlehead Crack (no speedball) rebiased for Tungsram e80cc and Philips Jan 6080WC with film bypass caps on electrolytic output caps. Fed from an RME ADI-2 Pro in NOS filter mode. mod'ed HD800 from @Mikoss. Having a great listen to some of my favorite jazz.
@atomicbob have you tried the Amperex e80cc/6085? It’s a bit warmer and fuller sounding compared to the tungsram. Since you don’t have the speedball upgrade the tungsram is probably better tough.
I love my BH Crack. Such a pleasant listening experience
Haven't tried the Amperex e80cc. Did you mean 6080 or 6085? I don't know of a 6085 tube. I have considered building a second BH Crack and install the speedball (which I already have.) Just became enamored with the sound of the non-speedball version for the types of jazz to which I listen. Maybe I'm an auditory heathen but I like it.
Ok, I see what you are talking about with the 6085. But Ouch! do they ever ask a prince's ransom for those. My Tungsram e80cc were only $30 US. Yes there is something very intoxicating about a simple OTL implementation.
Big BIG fan of the SB'ed Crack w/ the Tungsram E80CC. I wish I heard one that was specifically biased for that tube.. cause even non-optimized for it, it was terrific. Amperex 5085 is indeed dope.. might still have it in my tube stash.. will send it to you @atomicbob if I find it. Tungsram's 12AU7 is a fav in the Crack for me, as well.
@FlySweep - I replaced the bias resistors with a 10 turn precision resistors. Must be careful about initial setting but with a DMM it is easy to rebias appropriately. Can get exact voltages desired this way. Probably better to have a small series resistor with the precision resistor to set an absolute minimum resistance and thus maximum current to avoid letting out the magic smoke.
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