Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: TIMBO on May 18, 2025, 02:46:47 pm
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Hey guys,
A mate has about a 100 of these and had put them aside for a reason, unfortunately many years have passed and we're not sure what that was.
We were toying with Robs micro bassman and possibly using them as power valves.
Anyone see a good use for them.
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Back in 2010 I designed an amp that made use of 6BK7, which is similar, slightly higher mu and transconductance. Both 6BQ7 and 6BK7 state design use as cascode amps for VHF. Recollection is I had good luck, amp sounded really good, but I decided not to build it and focused efforts more on conventional builds. IMO, outside of it's intended use, the 6BQ7 might be better suited for HiFi use - Similar mu to 6922/6DJ8/E88CC but with about 1/2 the transconductance.
--Pete
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I built the "deluxe Micro" with the 12au7 SE in parallel plate
sounds good... https://stillampd.com/silvertone-deluxe-micro-04
Might also be an option for the 6BQ7
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Thanks guys
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Yes, the use in place of ecc88 seems affordable
Franco
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Yes, the use in place of ecc88 seems affordable
+1 Basically the same as the 6DJ8/ECC88. Popular for hi-fi
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At Diy Italia we are planning an SE with a GU-50 as power tube (with a particular circuitry, not yet established in final way)
As that tube require a strong drive we have plan to use a driver between the preamp and the power tube, this driver is an ecc88 or equivalent tube
Franco