Two stages in series without coupling cap. Cathode res. in second stage shunt with series RC group /R trimmer - middle point connected to one of ends with nominal like cath. res... and el cap about 100-500 uF/. This schem. I used in my 300B.
I do think you make it input amp like the old einstein amp? this has 6sl7 input.
history of it.
Tyler Rourke tells how he built a replica of a hi-fi system built by Jack Rosenberg for Albert Einstein's 70th birthday gift.
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I do not now if multisim is buggy, but I do read really strange things with this cascode tryout.
See voltages with 350 volts supply, am I murphy? or isd this because it is winter, well, winter, 14 degrees is not really winter here.
But oke, serious I did think about the cascode because of using low mu triode who sounds most of the time better like 6sn7, I have 6h8c who sounds clearly better then 6h9c, but the penthode 6H51P did sound also well only microphonic, so a cascode who act as a penthode is much less sensitive I did read.
The Valve Wizard
regards
See voltages with 350 volts supply, am I murphy? or isd this because it is winter, well, winter, 14 degrees is not really winter here.
But oke, serious I did think about the cascode because of using low mu triode who sounds most of the time better like 6sn7, I have 6h8c who sounds clearly better then 6h9c, but the penthode 6H51P did sound also well only microphonic, so a cascode who act as a penthode is much less sensitive I did read.
The Valve Wizard
regards
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https://www.google.com/?gws_rd=ssl#q=SE+300B+schematics
I used this idea....Two stages 6SN7 preamp for end stage 300B....with poti in series to second shunt cap of sec. triode 6SN7.
In Your schem all stages are coupled with interst. caps.
I used this idea....Two stages 6SN7 preamp for end stage 300B....with poti in series to second shunt cap of sec. triode 6SN7.
In Your schem all stages are coupled with interst. caps.
https://www.google.com/?gws_rd=ssl#q=SE+300B+schematics
I used this idea....Two stages 6SN7 preamp for end stage 300B....with poti in series to second shunt cap of sec. triode 6SN7.
In Your schem all stages are coupled with interst. caps.
Do now I build hybrides (mosfet/tube), it is different then build like yours, I need more amplification with mosfets.
But have some different idea,s about how, it is shure a challence but hee, this is what we all do here tought.
regards
I go sleep, it is over midnight here, like in bulgaria afcourse.
I'm in San Diego.....More linearity modes don't mean better sound, IMO....
your location is Bulgaria in diy forum.
I'm in San Diego.....More linearity modes don't mean better sound, IMO....
Yes I now, that is discussion who is speaken off for a long time, I have now Laurel and hardy on tv, old, old, but sometimes it is suprising.
I am busy with a full Mu stage hybrid, who has no cathode followers, to listen.
Iam to buy a 6H9C matched pair, I wonder if this values are good as matched??
tube 1:
Ia 1 = 2,7
Ia 2 = 2,5
S 1 = 2,5
S 2 = 2,1
tube 2:
Ia 1 = 2,9
Ia 2 = 2,18
S 1 = 2,0
S 2 = 2,0
Thanks
I did never match them, because it is input and such little differencies give not problems with balance. I have no balance or tone pots, just volume.
regards
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