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In Reply to: rca 5963 posted by earnie3 on August 19, 2006 at 06:21:02:
I was thinking the same thing... but the manual does not list this one as an interchangeable type. I'd ask Kevin Deal. I had the 5963's in a Foreplay preamp at one time and they sounded nice - but very microphonic.On a side note, I put in a quad of SED EL-34's this week into the Prologue 2 and they really sound great. I am finding them to be a lot more enjoyable to my ears than the EH KT-88's I had in there previously, though the stock KT-88's were nice. Next up are the Tung-Sol 6550s. I am using EH 12AU7's and Sovtek LPS 12AX7's for the preamp tubes. May I ask what tube combination has worked well for you with this amp?
later,
-mb
Follow Ups:
I am using penta solid plate kt-88's tungsol reissue 12ax7 and the stock 12au7's what are you using for speakers and cables with this amp???
Speakers are Joseph Audio RM22si, cables are Nordost Flatline bi-wire, and Nordost Solar Wind interconnects to the cd player (Arcam 73T). For vinyl I've got a NAD 533 with a Bottlead Seduction phono-pre and cheapie Audio Research interconnects...-mb
I have meadowlark osprey's dh labs cablng and a rega apollo cd how are the eh 12au7's different from the stock one's?
In the PL2 that I've got, the stock 12AU7s sounded kind of dull/flat. To my ears, the sound became slightly cleaner/clearer when I put the EH 12AU7s in... Of course how tubes sound is subjective and YMMV. I have also used the Ei 12AU7s and Mullard CV4003 with nice results. As far as the pre-amp tubes go, however, I feel the biggest difference was noticed when I dropped those Sovtek LPS 12AX7's in... really brought the vocals up out of the mix nicely.
A lot (not all by any means) of 5963s tend to be microphonic. Be sure they are tested for microphonics when you get them.The 5963 has a voltage rating that's lower than a 12AU7, but it really isn't an issue for the vast majority of uses.
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