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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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In Reply to: Siemens 5814a Triple Mica burn-in changes posted by Japesgalore on June 20, 2008 at 07:33:09:
Japesgalore,
I had a similar situation with my McIntosh MR67 tuner. After rebuilding the power supplies and complete retubing, the sound had lost the palpable quality in exchange for neutrality and transparency. And, while this is a more modern, cleaner sound, it doesn't have the spine-tingling sound of the original tubes.
I haven't fussed with it, but I think I used too many very neutral Telefunken and Siemens tubes and too many military versions- low microphonics versions sometimes strike me as "tight" constrained.
The Siemens triple mica 5814A is along with the Amperex 7316 and CBS 5814A, among my favourite 12AU7s. It seems, though, a tube better for waking up vintage gear -all my 12AU7s go in McIntosh, Scott, and Fisher- than in modern stuff. The Amperex 7316 is a "light" tube also. The Siemens is a go-getter, really pushig the sound along- dynamic and fast. It's also so transparent that in certain uses it can make the sound seem "thin". This can act as a kind of remedial compensation in vintage that seems a bit sluggish or warm, but it might not be as comfortable in modern, already neutral stuff.
Possibly, in combination with the Tesla E83CC- if they're the frame grid ones, then you're hearing two tubes that happen to be especially airy and nimble, but may add up to lack of weight and authority. I bought Telsa ECC803S frame grids to replace Telefunken 12AX7s in a Fisher 800 and the Teslas were lighter than the original Telefunken- which I find light already.
I don't know the Jolida JD100S CD player, so the effect of tubes changes is a guess, but my thought would be to first try a really lush and deep 12AX7 in place of the Teslas. The 12AX7s will have more effect on the sound than the 12AU7s and the Siemens are so neutral they will not add or saubtract. In my view the Tesla frame grid may be too polite and delicate for digital.
> You might consider NOS Sylvanias labelled for organs like Baldwin or Conn. These are the tiniest bit warm, and an enveloping richness- that is almost cloying in soft, vintage receivers, but might be quite good at giving CD's a little artificial presence.
Cheers,
Bambi B
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- The Siemens 5814A Triple Mica is aggressive and transparent - Bambi B 06/21/0810:03:53 06/21/08 (0)
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