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Old 9th September 2008, 06:59 PM   #101
Salas is offline Salas  Greece
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Zoran, have you used that tube? Found 8 and they are on their way. Have an opinion? NOS Soviet 80s.
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Old 9th September 2008, 10:03 PM   #102
Salas is offline Salas  Greece
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Anybody ever used the NOS Soviet 6V6 equivalent 6P6C? Impressions?
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Old 10th September 2008, 07:55 AM   #103
Zoran is offline Zoran  Serbia
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No Salas I didnt use that tube...
Why not to try it?
If You have tube tester, before puting the tube into
preamp it would be nice.
*
maybe it have little bit different internal conn.
in that way
*
some EL84 russian,
have separated G3 from kathode (like EL34)
every electrode separate pin...
but this is better,
and should be connected to anode
*
Maybe the case in that 6V6 ?
*
please do not get me wrong
but your preamp shifting phase for 180deg
if You dont want OT
ADD some input transformer
*
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Old 10th September 2008, 09:58 AM   #104
Salas is offline Salas  Greece
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I have good NATO NAVY tube tester. I will check it. It is Soviet 6V6.

Why this thing worrying with 180deg shift? Are you concerned about absolute phase? Every common cathode inverts. I can invert again by changing the polarity at the speaker inputs. Why you think I must do that only with a transformer and not otherwise?
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Old 10th September 2008, 01:38 PM   #105
Zoran is offline Zoran  Serbia
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I am not worry,
but that one of the basic technical design goal
Device
phase-in=phase-out...
*
I simply can not accept, that is something else better,
or that is the same, or whatever...
*
expetialy if chassis ground is used to audio ground...
*
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Old 10th September 2008, 02:32 PM   #106
Salas is offline Salas  Greece
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A phase inversion can be restored anywhere in the chain. Phase distortion is more difficult to restore and carries impulse response implications. As it is, it has bandwidth in the hundreds of kHz. You prefer some transformer there so to narrow bandwidth more?
Our LPs and CDs have random absolute phase, I remind you.
I disagree in ''basic technical design goal'', its just a decision. It must be known in multi way multi amp systems, and taken account for. Would be a cancellation hazard in reinforcement. Where things must be standard and anybody can hook up whatever without knowing more. And they always hit the reverse button on the desk if something sounds thin. No utilization problem in a personal steady home system with a known inversion that I can see.

Better or same is relevant, but ''adequate'' is certain. Its about personal philosophy, that is why we do DIY. ABX listening, HEC amp 1ppm distortion science has enough logical data to lough on tube DIY anytime if likes. So its a personal matter why we like something like an exotic pre amp with power tubes in line duty in whatever style...

It works totally quiet on 95dB speakers with 28dB amp as it is grounded. Itself contributes an additional 15dB. It is referenced to chassis, it does not go through it. It uses copper foil sub star points that meet fixed with a security bolt at the copper chassis referenced master star.
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Old 10th September 2008, 08:48 PM   #107
Zoran is offline Zoran  Serbia
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OK, whatever...
seems that easyer and less demanding design is always better...
if that is exotic, what is preamp with for instance 10Y tube,
or some older DHT good sounding tube...
*
I didnt mean to underesimated the design,
just oposite, like I noted in some posts before,
*
even had a personal experiments in pentode preamps
6V6, 6L6, EL34...
*
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Old 10th September 2008, 09:18 PM   #108
Salas is offline Salas  Greece
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In ''exotic'' concept I don't mean mine (said in whatever style) but all the big tubed rare line or RIAA stuff made one off that ain't commercial.
The Japanese school sounds anemic to me by the way. Low swing niche curved silver opt etc has a butterfly sound that I find too fragile. I like the French school of sound, then the English and Italian. Also Serbia has very good tone, very melodic, yet with a bit of German like discipline.
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Old 10th September 2008, 09:24 PM   #109
Salas is offline Salas  Greece
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Quote:
Originally posted by Zoran

*
even had a personal experiments in pentode preamps
6V6, 6L6, EL34...
*
Please give a URL for your stuff if online, we would all like to admire. I personally favor Serbian tube designs a lot.
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Old 10th September 2008, 09:35 PM   #110
Zoran is offline Zoran  Serbia
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I did not chalenging anyobody...
I respect other diy-members work...
I am not inventor of something, circuit, theory...
so please,
release...
*
and why it is important in which country somebody living?
*
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