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In Reply to: RE: 300B run conservatively? posted by Thorsten on April 02, 2014 at 10:23:24
Hi,
I have my 300b tube run with B+410v, 85ma, Rk 750ohm, 2k7 OPT, 8Ohm tap.
To switch to your suggested, I guess I could just replace the cathode resistor with 1Kohm, and use the 4Ohm tap?
How much power do I expect to drop?
Does this work with only 8Ohm speakers? My speakers are the AN-E with the hemp cones, which has 6Ohm impedance I think. Will you expect the 350v/60ma/4Ohm tap to work?
On the other hand, to squeeze a few more watts from the 300b amp (which is more applicable in my case with the speakers I have) what is a reasonable operating point? The amp is 2stage with a single c3g triode wired driving a 1:1 bifilar IT, lithium battery bias in the gird.
Thanks. Vi
Follow Ups:
Hi,> I have my 300b tube run with B+410v, 85ma, Rk 750ohm, 2k7 OPT, 8Ohm tap.
> To switch to your suggested, I guess I could just replace the cathode
> resistor with 1Kohm, and use the 4Ohm tap?Maybe 1.2KOhm, rather than 1k.
But yes, you could try.
> How much power do I expect to drop?
It's all in the WE datasheets.
> My speakers are the AN-E with the hemp cones, which has 6Ohm impedance
> I think. Will you expect the 350v/60ma/4Ohm tap to work?I don't expect much higher power operating points to work.These are rather low efficiency speakers.
> On the other hand, to squeeze a few more watts from the 300b amp
> (which is more applicable in my case with the speakers I have) what
> is a reasonable operating point?I used 400V/80mA/3K in the diyhifisupply Lux 91, together with a choke loaded cathode follower. That started as a custom build for someone with AN-E's...
Ciao T
Sometimes I'd like to be the water
sometimes shallow, sometimes wild.
Born high in the mountains,
even the seas would be mine.
(Translated from the song "Aus der ferne" by City)
Edits: 04/04/14
Yo Mr T..
Did you check the math on any of the WE data re: graphs for HD wrt op points?.. Some of it doesn't represent power out available so correctly.
Shane
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