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Old 9th November 2005, 02:32 PM   #1
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Default Passive RIAA with tubes

Joe Tritschler had a very nice article in October 2003 AudioXpress "Borberly's RIAA Amp with Tubes". He is now offering a kit of stereo boards on his website - and it should be much easier to work with as he has modified it for the 6DJ8

http://tpadevices.com/hifiproducts.html

for $49 a pair of boards it would seem to be a good deal !

fwiw, here's what the schematic for the original design looks like on the SIM:

Click the image to open in full size.
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Old 9th November 2005, 03:17 PM   #2
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Have someone the kit build?
How does it sound please?
Thanks.
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Old 12th November 2005, 12:29 AM   #3
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now, can we make it work with one ECC88/6DJ8?
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Old 12th November 2005, 12:41 AM   #4
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Quote:
Originally posted by jackinnj
now, can we make it work with one ECC88/6DJ8?

if 1,7x smaller signal on output don't bother you .........
yes
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Old 12th November 2005, 02:54 AM   #5
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Quote:
Originally posted by choky



if 1,7x smaller signal on output don't bother you .........
yes

so we just have to crank the line amplifier a bit...
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Old 9th December 2005, 09:07 PM   #6
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well I got a pair of boards from Titschler -- the results are shown below.

the boards which were delivered were quite a bit different from the design published in AudioXpress (and that's not a bad thing, 417A's or 5842's are expensive).

In the stock design 100nF/400V coupling caps were used -- and you can see the droopy LF -- so I inserted a 1.0 uF/ 400V WIMA PP and the results are much better.

I show comparison with the Audio Research SP8 and Koren phonoamp stages modeled in SPICE:

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