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Old 18th February 2009, 01:11 PM   #11
Tweeker is offline Tweeker  United States
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6S19 mu is more like ~3. Models for high vibration environments are readily available though.
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Old 18th February 2009, 01:16 PM   #12
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thanks, Tweaker

Please, can you be more precise/specific about models for high vibration ?

Cheers,
Paolo
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Old 18th February 2009, 01:39 PM   #13
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Quote:
Originally posted by inertial



Linestage? interesting, seems perfect in this application IMO
No microphonics ( excuse , I need datas for make "statistic")?
What brand?

Cheers,
Paolo
They were GE brand. Never saw any other brand.
cheers,
Douglas
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Old 18th February 2009, 02:01 PM   #14
Tweeker is offline Tweeker  United States
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6C19π is rated for vibration loads to 2.5g.

mu ~2-3
gm ~7.5 mhos
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Old 18th February 2009, 02:24 PM   #15
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Oh thanks,

but IMO this seems really half 6SA7........

Ok, I understand better (no) microphonicity than 7233 but lower mu,

Cheers,
Paolo
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Old 8th March 2009, 07:16 PM   #16
bappe is offline bappe  Sweden
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Default Here is how i use it....

Made an amp with this tube a few years ago and it turned out to be one of the best ever. It is wonderfully dynamic and "black" sounding. The only drawback is itīs limited power output. I you want a few more watts you can allways replace the ccs at the output tubes with a decoupled cathode resistor. Another thing not in the schematic is a diode from ground to the input cathodes to avoid exessive grid current at startup.

BR,
Anders
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Old 8th March 2009, 07:18 PM   #17
bappe is offline bappe  Sweden
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Default And the ps:

...
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Old 9th March 2009, 11:38 AM   #18
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Cool amp, Anders!

Indeed I have to drive (both) a headphone 300 ohms and a solidstate power buffer ( not sure, I think a pair/triplet of sanken SAP16N-16P).
The 7233 + a previous 6n6P will be the VAS....

"dark sound" ? Looks promising!

No microphonicity ? (I am waiting my 7233's from USA)

Thanks,
Paolo
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Old 9th March 2009, 12:20 PM   #19
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Hej Bappe,
Nice to see that oleī schematic again!
Still havenīt built my E130L-triode on the same theme.
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Old 11th March 2009, 01:54 PM   #20
bappe is offline bappe  Sweden
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I am running a 2A3 variant on the same theme with all Lundahl iron and it is very nice indeed!

/Anders
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