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RE: Favorite Tubes for DIY

Notice the "gorilla" of a filter choke that was added to the OEM "iron" set. >>>

Absolutely gross - destroys the look. Yuk!

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I don't use loop feedback.

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Morgan Jones has a clever rewiring scheme for the OPT to make it sound better - hard wires the secondaries for 4 ohms.

<<< Perhaps Williamson style circuitry using the 3A5 after the "concertina" phase splitter is indicated.>>

I like to have a balanced in option, so I use a diff pair with CCS under it. I use the ECC40 if I need more gain and only have room for one stage, or I rely on some gain in the preamp if I just use DHTs.

<< You're the expert on DH types, not me. Is there a good sounding single, modest mu, small signal DHT in your "pile"? I'm thinking of a strange, but likely palatable, "cocktail". DHT voltage gain DC coupled to a (SIC) ZVN0545A "split load" phase splitter holds the bottle count down to a reasonable level.>>

Not really - there are a few DHTs with higher gain but the plate resistance gets silly - see 1H5, 3a/142A, 3a/108, DC80, 826, 1G6G. No - the thing to do is just use three stages in the amp, like 01A, 10Y, 300b. It's a predictable combination but it sure as hell works! Andy


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  • RE: Favorite Tubes for DIY - andy evans 04:18:50 07/01/08 (0)

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