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In Reply to: Re: 26 instead of 27 driver w/45 posted by njjohn on January 30, 2007 at 20:32:10:
is there a public schematic for this amp?
Thanks in advance
Follow Ups:
I don't think there is. There are seperate schematics for the 6sn7, 26, and 45.The builder of the amps passed away and I believe he does have a schematic of the 26 amp but I have to wait some time before the family is ready to help out.
And I can recommend it with the vintage opts that he used because there is an interaction between the design and the opts. It may be as good with other opts but I can't vouch for it.
x
I guess i shouldn't have generalized so much about the 56. i believe I tried to substitute it in only one amp, and as described it has more gain than a 27 but it did not sound good. I think I had purchased a few of them on ebay, and I thought i wasted my money on this tube. But perhaps nothing can be discounted the way I did it.The opts are particular vintage Hammond opts. Some are in amps built be Webster and I think they are in what are called tone cabinets which are speaker cabinets (with an amplifier) which were built specifically for organ amps in the 1940's. I believe they were 2a3 amps. The other ones were bigger opts in larger chasses and I'm not sure what they were in. the latter were built in the 50's. I think the first one has 60 dc resistance, and the latter ones had 120 dc resistance. I think the latter ones may have been in 6v6 amps and maybe other kinds too. They were also organ related amps.
The opts are push-pull but they are used in single ended operation which was also done by Korneff with Sansui opts in his early amps.
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