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Vintage Asylum Classic gear from yesteryear; vintage audio standing the test of time. |
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Vintage Asylum Classic gear from yesteryear; vintage audio standing the test of time. |
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In Reply to: RE: BTW- Vintage Power Amp with Passive Pre posted by Bold Eagle on July 14, 2012 at 10:13:21:
I'm surprised by that Sony CDP's 1100 Ω O/P impedance. Under 1 KOhm is what's appropriate into the IHF "standard" load that all commercial products are supposed to be capable of driving. Perhaps the slogan should be: Sony, a lot of baloney. ;>) The company has gone downhill, since Morita died. :>(
It is possible to do a JFET buffer with a unipolar PSU, but caps. in both the I/P and O/P circuitry are needed. With their capability for self bias, JFETs, depletion mode MOSFETs, and tubes can have DC coupling on the I/P side of a voltage follower setup, if a bipolar PSU is used.
FWIW. I would use a buffered volume control in combination with a Sony TA-3200F power amp. I believe strongly in adhering to the 1:10 impedance rule. A 10 KOhm passive setup would work, provided VERY low capacitance cabling (as in extremely short, braided, and unshielded) is used between the control and the power amp. Why handcuff yourself?
Eli D.
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Follow Ups
- RE: BTW- Vintage Power Amp with Passive Pre - Eli Duttman 13:11:20 07/14/12 (4)
- RE: BTW- Vintage Power Amp with Passive Pre - Bold Eagle 17:11:18 07/14/12 (2)
- RE: BTW- Vintage Power Amp with Passive Pre - Eli Duttman 18:04:49 07/14/12 (1)
- RE: BTW- Vintage Power Amp with Passive Pre - Bold Eagle 18:30:48 07/14/12 (0)
- Handcuffs........ - Neff 13:59:26 07/14/12 (0)
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