| phono stage's [message #31476] |
Thu, 24 November 2005 16:12  |
PakProtector
Messages: 935
Registered: May 2009
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Illuminati (2nd Degree) |
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How cheaply could one build a tube phono stage? I have seen the ET Seduction, and those guys are the King's of Thin. Different tubes? 2x 8532's? Little bit more gain is always good...:-) The 6DJ8 is quite attractive, but really good ones are 'spensive. I can see plenty of ways to complicate it! L-C filaments, Tube rectified, L-C for B+. Shunt regs...Yamamoto sockets. Super 'spensive RCA jacks. Not quite sure one should abandon the L-C filters.
cheers,
Douglas
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| Re: phono stage's [message #31478 is a reply to message #31477] |
Fri, 25 November 2005 07:30  |
PakProtector
Messages: 935
Registered: May 2009
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Illuminati (2nd Degree) |
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and of course, while getting away from cheapest, there are a few neat tricks. One to reduce the output Z of the first stage while simultaneously reducing noise: parallel sections of a twin triode. This offers a few neat opportunities to pull from developed circuits, and make further improvements. and I am already getting away from a 'Cheapest sol'n', heh-heh-heh... Long skinny chassis, PS at one end, and amplifier at the other. Guinevere style plate loads on the final stage so it can drive a reasonable load. Parts are sure cheaper than for a big, high power amp, yes?
cheers,
Douglas
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| Re: phono stage's [message #31479 is a reply to message #31478] |
Fri, 25 November 2005 11:25 |
Damir
Messages: 1005
Registered: May 2009
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Illuminati (2nd Degree) |
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If I could - probably LCLC, then left ch LCLC and right ch LCLC, total 6 chokes and 6 caps - for "stand alone" unit. But, if we want to put it in the "Guinevere" chasis, probably some more modest solution is in order. For the heaters, Schottky bridge + IC regulator would do, IMO.
But, yes - how "simple" or "not expensive" can it be without too much compromise? I mean - building RIAA with cheap parts (Cs & Rs) and with "average, but cheap" tubes doesn`t have too much sense?!
I don`t have a ready PS for the moment (fire problems:-)), any chance that you can try this circuit, or similar?
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| Re: phono stage's [message #31480 is a reply to message #31479] |
Fri, 25 November 2005 11:41 |
PakProtector
Messages: 935
Registered: May 2009
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Illuminati (2nd Degree) |
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Hey-Hey!!!,
For simplest RIAA, the pasive between the two triodes is quite appealing. I have a few that can be adjusted for almost *ANY* pair of triodes. It ought to be fairly easy to implement. I don't think I am going to go with mono supplies. The loads ought to give me a lot of PS isolation.I have a pair of 9-pin sockets, salvaged from Tektronix diff amp plug-in's. The socket is suspended on Be-Cu springs. One of a kind( well..two of a kind ). Been saving them just for a phono pre. now....which two triodes? I'll fit this in between the construction of the 4E27 and 813 amps. The 813 really has me going. 80W from a pair, in Class A.
cheers,
Douglas
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