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The perfect phono preamp.
The perfect phono preamp.
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Old 25th October 2006, 01:41 AM   #11
Tubelab_com is offline Tubelab_com  United States
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I just love red glowy things.
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Unless they are resistors, or plates.
That is usually the case for me.

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Hey! Wait! I thought resistors just smoked and caught on fire.
I have proven that the white ceramic sand filled ones can glow red, and survive! So can the old green ones. And that Electro Harmonix KT88's can glow red and blue at same time all while sounding pretty good.

Seriously, it is time for a new phono stage. My current one is getting pretty noisy, and it is not the tubes.
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Old 25th October 2006, 10:25 PM   #12
ErikdeBest is offline ErikdeBest  Switzerland
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Frank presented two RIAA stage together with the 12BH7A WCF. Both have two stages build around the 7025. SY would say it has got to few tubes...Morgan Jones explains why, in the third edit...blabla

Morgan Jones's balanced RIAA preamp got 8 tubes per channel. Some are used as CCS, but there are still two sand CCS's in there, so anyone interested could hit the 10 tubes/channel figure - or even go beyound that - maybe with a tube regulated PS, but afther this
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It certainly instructed me to run from tube regs at full speed.
I will shut up!

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Old 26th October 2006, 12:30 AM   #13
SY is offline SY  United States
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The perfect phono preamp.
Mine has 4 tubes. Oh, yes, and 12 FETs... that should put off about 99% of the intended audience.
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Old 26th October 2006, 12:49 AM   #14
Geek is offline Geek
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After a week designing, I have one almost completed. All tubes, curve is perfect, sounds good, gotta make it sound great before posting

Not a dang 12AX7/7025 in it either
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Old 26th October 2006, 12:53 AM   #15
SY is offline SY  United States
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The perfect phono preamp.
I gotta see this! Will you be showing off the goods?
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Old 26th October 2006, 01:24 AM   #16
arnoldc is offline arnoldc  Philippines
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Morgan Jones's balanced RIAA preamp got 8 tubes per channel. Some are used as CCS, but there are still two sand CCS's in there, so anyone interested could hit the 10 tubes/channel figure - or even go beyound that -
My friend made a phono preamp with six 407A and 4 ECC88 tubes in there The chassis is too big, made of stainless steel, and the power supply is bigger than as 1200VA APC UPS

Sy, are those FETs readily orderable? From RS Compnents perhaps? C'mon tell me the tubes So I will have time to find 4 of them
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Old 26th October 2006, 01:31 AM   #17
SY is offline SY  United States
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The perfect phono preamp.
I've never dealt with RS so I honestly don't know. I got mine from Mouser (Supertex DN2540). You'll need to order extras to accommodate matching; I got 100 of them, split them with a friend, and had no trouble putting 6 matched pairs together from the 50 I kept. At about US$1.50 each, that's not too prohibitive.
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Old 26th October 2006, 02:08 AM   #18
astouffer is offline astouffer  United States
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Speaking of preamps, any thoughts on this one?

http://margo.student.utwente.nl/el/t...p/fb-e180f.gif

Not sure where its from but its been on the internet for a long time now.
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Old 26th October 2006, 04:08 AM   #19
Geek is offline Geek
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Originally posted by SY
I gotta see this! Will you be showing off the goods?
You betchum!


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Originally posted by astouffer
Speaking of preamps, any thoughts on this one?

http://margo.student.utwente.nl/el/t...p/fb-e180f.gif

Not sure where its from but its been on the internet for a long time now.
E180F is a great tube, but I've only used it trioded. The EQ method I haven't tried.
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Old 26th October 2006, 09:06 AM   #20
Giaime is offline Giaime  Italy
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That's interesting, because I am designing a phono amp too. An hybrid casconde on the input, the lower device being a single fet for MM cartridges, and a quartet of bipolars for MC cartridges. Passive RIAA (SPICE says ±0.05dB flat from 10Hz to 20kHz) and then CCS loaded ECC88 stage (but I'm not sure about it). Will drive an Aikido linestage in the same chassis, 6CG7 + 5687 tubes
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