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Old 24th February 2013, 11:07 AM   #9331
RCruz is offline RCruz  Switzerland
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Thank you hope you enjoy it
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Old 25th February 2013, 07:31 AM   #9332
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Default Thinking about folded...

Hi folks-

I've been thinking of doing the folded. Hmm, to convert my 11.02.F0 build (easier) or to build anew? I'll have to get some new r's and c's. Finding 2SK369's pre-measured in the right IDSS is proving hard. I'd rather not have to buy a batch and match-up. If anyone has a spare pair in the 9-12 mA IDSS range, I'd gladly pay for them. I will be using the 1.2R shunts I've already built.

The FT-2 .047 teflons came yesterday! So at least I got that part. Small! Body is only 32mm long. I've got more than I need, so can spare a few if anyone needs them.

Cheers- Kent
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Old 25th February 2013, 08:04 AM   #9333
Salas is offline Salas  Greece
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Just convert. Its a very nice build your previous to just spare it. The proper value FT cap is nice. Looking for ~9.8mA mA bias through Q1 does not absolutely mean 11mA IDSS Q1 if you can't get hold of a couple. It may mean higher ones also with adequate increase in R2 value until you get about 9.8mA through it. A wee bit more contribution in noise by that resistor will mostly stay under the ear's radar.
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Old 25th February 2013, 07:10 PM   #9334
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I built this project last week as my first phono preamp, I'm pretty happy with it. Here's a quick frequency analysis for both channels:
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Old 25th February 2013, 07:39 PM   #9335
Salas is offline Salas  Greece
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Very good channel balance. Which one type of all versions you made? Any pics?
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Old 2nd March 2013, 06:28 AM   #9336
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Default New here

I would appreciate a link to the current/latest schematic and parts list for this project.

Thanks,
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Old 2nd March 2013, 07:05 AM   #9337
vgeorge is offline vgeorge  Greece
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Go to first post, you will find all the relevant links.
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Old 4th March 2013, 03:29 PM   #9338
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Hey Salas, I built the 11.02.F0 version with the shunt regulator and everything. I took my time to handpick the equalization network components and the balance turned out pretty good. The orange chassis is from a car battery charger that I found.
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Old 4th March 2013, 04:34 PM   #9339
Salas is offline Salas  Greece
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Nice. Did you manage it to pick minimum hum from the close by trafo and mains cabling also?
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Old 4th March 2013, 09:02 PM   #9340
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At the listening level where I start hearing hum I'd be kicked out of my apartment anyway, so no real qualms there.

I specifically did not to use any quality parts other than the JFETs, and it's performance is absolutely good, but when I build one more properly again in the future I'll get a more spacious chassis as well.

It's a great circuit, thanks for sharing and stewarding it.
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