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Old 23rd May 2007, 05:23 PM   #11
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Quote:
Originally posted by kstagger
I have Philips, Haltron, Valvo, Siemens and Lorenz C3ms...
The C3m was made by Philips (Valvo), TFK, Siemens and Lorenz; Haltron is only a rebrander


Quote:
Originally posted by kstagger
... TFK was had a solid-mesh - interesting. Some of the older EF40s used a solid-mesh and it's also used with some EF86 tubes....
This mesh in the C3m, EF40, EF86, EF806 is the sreen, the anod is solid (analoque 6C6).

Regards Andreas
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Old 23rd May 2007, 06:02 PM   #12
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Quote:
Originally posted by bequerel
Great looking preamp, kstagger!

Nice to see projects where the constructors have made an effort to make their projects look good, too.
thanks - I made that preamp to be used for a long long time so I could concentrate on other parts of my stereo. So far I've been very pleased with the sound - but I may be going back to a triode connected EF86 for my next linestage project.
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Old 23rd May 2007, 09:04 PM   #13
coresta is offline coresta  France
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Quote:
Originally posted by AndreasS


The C3m was made by Philips (Valvo), TFK, Siemens and Lorenz; Haltron is only a rebrander
and the same plants for C3g ...

AndreasS Pierre
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Old 23rd May 2007, 09:11 PM   #14
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kstagger,
nice looking preamp! How did you write the letters on the top?
Are they engraved?
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Old 24th May 2007, 12:31 AM   #15
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Quote:
Originally posted by resident
kstagger,
nice looking preamp! How did you write the letters on the top?
Are they engraved?

thanks - it's all done via Front Panel Express
http://www.frontpanelexpress.com/

the software is easy to use once you get the hang of it...
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Old 24th May 2007, 08:48 AM   #16
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Thanks! I'll ask them if they send to Europe too.
Otherwise, does anybody know an European manufacturer?
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Old 24th May 2007, 09:52 AM   #17
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Quote:
Originally posted by resident
...Otherwise, does anybody know an European manufacturer?
Yes, pls. ask Schaeffer, Berlin

http://www.schaeffer-apparatebau.de

Regards Andreas
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Old 24th May 2007, 10:26 AM   #18
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thanks!
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Old 4th June 2007, 10:29 AM   #19
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kstagger, if you are still with us on this thread:

Did you "lift" the heaters up by means of a voltage divider, let them float or did you ground them?

The anode voltage is relatively high, so I would suppose that you exceed the maximum cathode to filament voltage differential if you did not "lift" the heater supply?

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Thanx!
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Old 4th June 2007, 11:55 AM   #20
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I just used a diode bridge into a capacitor, followed by a 7820 3-pin regulator and some more capacitance. Grounded filament on one side. I probably could have gotten away with AC... but didn't have a suitable transformer on hand.
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