Winston O'Boogie said:Forgot: In case you weren't aware, the correct plate resistor value for balance is 1/gm of the valve you're using, give or take some depending on load etc. But that gets you in the right ballpark to check out things further.
As you were...
john12ax7 said:Why not get a step down? Tubes can put out a lot of voltage, but struggle more with current.
BluegrassDan said:I’ve been using the Jensen 4:1 output tx and have wondered the same: whether a 2:1 or 1:1 would give good results....higher output level.
Using the Jensen cascode follower schematic with 12BH7.
BluegrassDan said:I’ve been using the Jensen 4:1 output tx and have wondered the same: whether a 2:1 or 1:1 would give good results....higher output level.
Using the Jensen cascode follower schematic with 12BH7.
ruffrecords said:I have never had much joy with White Followers, they seems to clip long before they ought to. I much prefer an SRPP running at about 6mA which will easily poke +20dBu into 600 ohms via a 2:1 transformer.
Cheers
Ian
ruffrecords said:I have never had much joy with White Followers, they seems to clip long before they ought to.
Cheers
Ian
kambo said:according to Jensen, you have 26dbu in to 600 ohm!
at which part its clipping i wonder ?
BluegrassDan said:I’m gonna try what you suggested and report back.
Winston O'Boogie said:I suspect the transformer would crap out above that. However, again, the Jensen schematic isn't optimised for equal push-pull.
We need a better value for Ra which is 680 ohms in the Jensen schematic.
VgRa/rpmu/rp = Vg/rp
Solved for Ra equals:
muVgRa/rp² = Vg/rp
muRa/rp = 1
muRa = rp
So:
Ra = rp/mu.
Ra for a 12BH7 is 5100. Mu is 16.5.
So Ra = 310 ohms.
kambo said:jensen schematic is not bypassed!
kambo said:just tuned 6sn7 wcf 2:1 out... 3.4 mA 8)
my SM57 never sounded this good
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