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Old 25th May 2013, 08:52 AM   #2431
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Nick you have a pm ..
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Old 25th May 2013, 04:33 PM   #2432
Salas is online now Salas  Greece
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Quote:
Originally Posted by stajo View Post
The comp cap is OPT dependant also and I dont have the A-410s in that Hafler constructed the circuit for. I use Z565
Of course its a comp for the total transfer. Surely it takes to measure squares to tune since the OPT is another and the Rfeedback is another.
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Old 25th May 2013, 04:42 PM   #2433
stajo is offline stajo  Sweden
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Of course its a comp for the total transfer. Surely it takes to measure squares to tune since the OPT is another and the Rfeedback is another.
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Old 10th July 2013, 09:16 PM   #2434
stajo is offline stajo  Sweden
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Hello. I know it says somewhere in the thread but I cant find it now. Whats the heavyest load the anode follower version can drive? Around 5 k? I would need something to drive 2K8 Z in with a decent amplification.
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Old 10th July 2013, 10:27 PM   #2435
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2.5K min for the cathode follower unity gain one.
No less than 15K for the 15dB gain common cathode one.
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Old 24th September 2013, 05:47 PM   #2436
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With the current setup in the schematic Salas drew, whats the operating point of the 6v6 or plate current? Im sure its in the thread somewhere, just haven't found it yet.

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Nick
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Old 24th September 2013, 06:16 PM   #2437
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Around 22mA depending on tubes brand and vintage.
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Old 24th September 2013, 07:13 PM   #2438
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Quote:
Originally Posted by Salas View Post
Did anybody build or listen to a 6V6 triode connected line preamp? I think it may be interesting to build one since I have some NOS. Maybe SRPP.

Later full schematic
Cathode follower version
A recommended parallel regulator
A recommended series regulator
Salas the link for "A recommended series regulator" doesn't work.
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Old 24th September 2013, 09:07 PM   #2439
nhuwar is offline nhuwar  United States
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Around 22mA depending on tubes brand and vintage.
Cool thanks Salas, the current is what I was needling to know. I'm hoping to build a pre pretty soon. But I'm going to go with the old school approach with lclc supply filter.

has anyone put a tvc on the output of this? I've got one with a inductance of 20H. I've read the inductance doesn't matter since its a reflected load. But I though I'd ask.

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Nick
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Old 24th September 2013, 09:53 PM   #2440
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I don't remember anyone to have reported on an output TVC and this preamp. If I remember well of course.
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