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In Reply to: RE: Sherwood S-5000 output-transformers posted by Eli Duttman on April 29, 2016 at 12:36:08
How about he starts with this 6BL8 you drew up and we he can tube from there?
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Follow Ups:
Hi Michael,
Thanks for this schematic.
Do you perhaps have an idea how much output voltage ('swing') this circuit can do (within reasonable distortion)?
Would it for instance also be suitable to use this circuit for 45-PP?
BTW, on the schematic is written 'draft', but have you already build this in practise?
Best regards,
Tubecase.
"Would it for instance also be suitable to use this circuit for 45-PP?"
That small signal circuitry can produce something in excess of 50 V. peak to peak, as it takes that much to drive "12" W. tubes and 7591s into clipping. Some extra "grunt" is needed, due to the GNFB loop.
A look at the #45 data sheet indicates that as much as 140 V. peak to peak are needed, depending on the specific operating condition set.
My "seat of the pants" assessment is that you could use that sort of circuitry, IF line stage gain is present.
Eli D.
Dude,
Those are my "hen scratches". ;> ) I "robbed" Sherwood and added some tweaks for a fellow with different O/P "iron" and no o'scope. Compare with the original and notice the brute force method of phase compensation.
Since you have Sherwood O/P "iron", you can copy the original "verbatim", but use a 6BL8.
A nice thing about a pentode I/P stage is the absence of worry regarding C Miller related HF rolloff. Don't try that 1 Mohm grid to ground value with a 12AX7 section.
Eli D.
Hi Eli,
I was thinking, when I would use a pair of 45's with these Sherwood output transformers. Then it might be a possibility to lower the amount of Feed-Back or leave it out totally? Because then the sensitivity of the amp would increase.
Best regards,
Kees.
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