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Old 23rd February 2011, 09:28 AM   #21
Zen Mod is offline Zen Mod  Serbia
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FM OK , but TV ........ wasting of time ........

JJ of course ......... I can't live without movies
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Old 23rd February 2011, 10:32 AM   #22
AndrewT is offline AndrewT  Scotland
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Hi,
the about to become obsolete analogue TV signal here in the UK is FM modulated for the sound channel.
There is also a NICAM digital channel for the sound.
Both are good in the UK when the sound engineers are allowed to make it good.
The new DTV offers only digital sound channel. I have no idea whether they use lossless compression like NICAM or they use a lossy compression method to squeeze all that digital information into a few MUXes.

I use my FM (only) Tuner and my TV as two regular sources for my sound systems.
I have done this since about 1974, before stereo became available.
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Old 23rd February 2011, 10:33 AM   #23
juma is offline juma  Germany
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Quote:
Originally Posted by Zen Mod View Post
... TV ........ wasting of time ......
Yes, most of it is even worse than that

I like those late night concerts on RTS2
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Old 24th February 2011, 08:29 PM   #24
ceteras is offline ceteras  Romania
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I always enjoy seeing a great diy amplifier get born, and this is one of them!
Quite beautiful.

A question: why are R11 and R18 shorted?
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Old 24th February 2011, 09:08 PM   #25
Zen Mod is offline Zen Mod  Serbia
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when you finish biasing procedure , just short them , to avoid losses
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Old 24th February 2011, 10:40 PM   #26
juma is offline juma  Germany
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Exactly. It's just the easy way to check the current draw...
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Old 25th February 2011, 06:05 AM   #27
ceteras is offline ceteras  Romania
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Oh, I thought those resistors were usually a part of the schematic, adding a current negative reaction in the final stage, helping to stabilise things.
Interesting, thanks!
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Old 25th February 2011, 09:42 AM   #28
juma is offline juma  Germany
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Laterals don't need that kind of stabilisation when there's only one pair per channel. For multiple pairs I use Source resistors to prevent current hogging. Some people advocate that even in that situation Source resistors are not needed because of their NTC. My experience is that NTC has it's limits in practical circuit and one can't rely on it to solve all the problems.

Since this amp has simple biasing procedure (just one pot to set) it's easy to have different bias settings - 1.3A in winter and the half of that during the summer (in regions with very high summer temperatures). The sonic difference is subtle if you don't play it to the max very often but dissipated heat is much lower.
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Old 25th February 2011, 11:02 AM   #29
ceteras is offline ceteras  Romania
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Understood, thank you!
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Old 8th March 2011, 07:27 PM   #30
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I'm surprised there isnt more interest in this circuit. I have a ZV9 which is wonderful but a little short on oommph! I also have quite a few hitachi laterals purchashed from Randy Slone way back when . My two way quarter wave speakers arent that friendly with the Zen approach so this might be the answer.

I wonder if Juma would be so kind as to elaborate on this retro-tech circuit.ie. setup and any other vital info. If I do this it would be point to point construction.

Believe me, juma's stuff is worth the effort!

Also ,i have an etching positive for Slone's Opti-mos amp, if someone is interested.
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