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Old 24th March 2013, 05:44 PM   #1181
neskor is offline neskor  Serbia
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This one was just for fun
I hope one day I will properly build one with Salas HV and better filament supply.
Even like this no hum and sounds great!
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Old 24th March 2013, 05:44 PM   #1182
Salas is offline Salas  Greece
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Quote:
Originally Posted by neskor View Post
That is good
I don't know how I get so high DC voltage on grid
Here are some pictures of my "Itchy in one day"
That Partridge has 250 Ohm DC resistance secondary, so you should factor that regarding what drop Merlin has.

Excellent little Itch! Congratulations!
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Old 24th March 2013, 05:48 PM   #1183
Salas is offline Salas  Greece
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Quote:
Originally Posted by neskor View Post
This one was just for fun
I hope one day I will properly build one with Salas HV and better filament supply.
Even like this no hum and sounds great!
Has good PSRR due to μ-follower, the input tubes are rugged for mechanical feedback noise, and the ra is not pushed by circuitry keeping that PSRR, so you can enjoy even with lesser PSU.
There is merit in using SSHV2 but not make or break for nuisance phenomena like buzz and too harsh tone in this case.
Having no hum is to your accolade as good grounding practician Itchy builder.
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Old 24th March 2013, 05:52 PM   #1184
neskor is offline neskor  Serbia
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I will try to change those Wima's with some Russian k40y PIO and Mundorf
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Old 24th March 2013, 05:59 PM   #1185
Salas is offline Salas  Greece
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You will have tolerance and dissipation factor issues with PIO...Do you have a good LCR meter? I would not use PIO in the RIAA filter. Maybe for inter-stage if you prefer the cozy PIO sound. Its a matter of synergy with everything in your full system and your taste.
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Old 24th March 2013, 06:03 PM   #1186
neskor is offline neskor  Serbia
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I can get them tightly matched for Riaa.
I will experiment
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Old 24th March 2013, 06:07 PM   #1187
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Quote:
Originally Posted by Salas View Post
That Partridge has 250 Ohm DC resistance secondary, so you should factor that regarding what drop Merlin has.

Excellent little Itch! Congratulations!
Salas I mesured direct to grid pin not at the input pin of SUT.
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Old 24th March 2013, 06:08 PM   #1188
Salas is offline Salas  Greece
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Quote:
Originally Posted by neskor View Post
I can get them tightly matched for Riaa.
I will experiment
Having MKS4 if I spied right in the little photo is not end of the world choice anyway, so experiment to your best of taste. But hook up your Cinemag and DL103 at a point to know the recipe is good for them too. What else is the system comprised of? How does that few EF80s with LCR RIAA mysterious pre you had VS your Itchy?
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Old 24th March 2013, 06:12 PM   #1189
Salas is offline Salas  Greece
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Quote:
Originally Posted by merlin el mago View Post
Salas I mesured direct to grid pin not at the input pin of SUT.
If you had the SUT non connected to the grid when you measured then you have much better batch 6N2PEV regarding grid leak. Which is a matter of build quality, materials, & residual gas pumping, for not having too many naughty ions.
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Old 24th March 2013, 06:14 PM   #1190
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Tubes are as per your advice with the rocket logo, really are very very good.
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