For what its worth, I played with the 4D32 in SE several years ago and decided that it wasn't a big improvement beyond what I was getting from KT88's, so I decided to save them for a push pull amp. Now I'm finding more power in 36LW6's or 35LR6's than the 4D32 in my push pull amps. I have been able to squeeze 250 watts from a pair of 35LR6's at the edge of dim red plate. I have about 30 of them and only 5 4D32's, so I'm going to beat on the 35LR6's.
The 4D32 still has that ultimate "bad boy" look and makes a not so shabby 150 to 200 watts in push pull, so I'll find some way to show them off in an amp sooner or later.
I had forgotten about my SE experiments until yesterday when I was digging through a box of dead circuits and found an SSE board with the big socket still wired into it. I don't remember the details, but I probably have pictures somewhere in my PC.
The 4D32 still has that ultimate "bad boy" look and makes a not so shabby 150 to 200 watts in push pull, so I'll find some way to show them off in an amp sooner or later.
I had forgotten about my SE experiments until yesterday when I was digging through a box of dead circuits and found an SSE board with the big socket still wired into it. I don't remember the details, but I probably have pictures somewhere in my PC.
I had been experimenting with the 4d32 PP using your universal driver board. It works and is very powerful. I decided I have a few very powerfull low distortion amps and wanted to try something different.
I love my TSE and wanted to play with a bigger single ended amp. It's fun trying to get the most out of what I have plus I'm learning a lot working with this fairly basic topology.
E
I love my TSE and wanted to play with a bigger single ended amp. It's fun trying to get the most out of what I have plus I'm learning a lot working with this fairly basic topology.
E
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regulated screens and while you are at it, regulate also the g1 bias, zeners are good to use here, no need for anything fancy, for G2 supply a mosfet type with zener strings will do nicely...
so then you can do away with the cathode resistor cum capacitor bias for more plate voltage and so greater plate swings...
finally a 2.5k load impedance for your output traffo, make sure your opt is gaped for at least 150mA dc...
post #10 study carefully the posting of PRR, there is a nugget of wisdom there...
another thing, do not get the b+ for the input stage from the g2 supply get it direct from main b+ instead..in my amps i use a separate winding and psu for the input stage i am able to do this because i wind my own traffos...
so then you can do away with the cathode resistor cum capacitor bias for more plate voltage and so greater plate swings...
finally a 2.5k load impedance for your output traffo, make sure your opt is gaped for at least 150mA dc...
post #10 study carefully the posting of PRR, there is a nugget of wisdom there...
another thing, do not get the b+ for the input stage from the g2 supply get it direct from main b+ instead..in my amps i use a separate winding and psu for the input stage i am able to do this because i wind my own traffos...
I wanted to update this thread and thank the community for the help. Here are a few photos of where I’ve gotten. Almost done. Just need a couple wooden boxes. I built mirror image monoblocks
Distortion at 1 watt and 10 watts.
I tried too many ideas to count but this seemed the best compromise
Distortion at 1 watt and 10 watts.
I tried too many ideas to count but this seemed the best compromise
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