#46 Re: Another go at PP -> IT -> PP
Posted: Fri Jan 01, 2021 5:11 pm
The place to discuss anything involving sound
http://ftp.unixodbc.org/phpBB3/
Sorry, I was probably a bit defensive earlier - maybe because where I have ended up is sounding really good.
Hi Nick, just trying to picture the circuit. So with the CCS’s on the anodes, I can see that the AC can only flow through the primary of the transformer. And if the two triodes are not perfectly matched, some DC will also flow through the transformer, which would be a definite no-no for the Sowters. But where is the blocking cap? Are there two caps, one from each anode to each end of the primary? Or are there two primary windings, with the cap between the two?Nick wrote: ↑Mon Jan 04, 2021 8:44 pm Just to be clear, The best result I got was not using the original Raven circuit with choke loaded anodes, but using a CCS on each anode and then the output transformer between each anode with a blocking cap. If you meed any depletion mosfets to make up the CCS's just let me know, I have lots, so happy to put a few in the post for you. I prefer the IXYS ones to the DN2540 ones as they seem to be less sensitive to static when assembling. But I have some of those as well and the IXYS current regulators.
The blocking cap becomes essential if you have nickel in the transformers. I would use it anyway to isolate the DC and AC current paths.
Thanks for the link, I’ve had a quick look, but there’s a lot of stuff in there so I’ll need to spend time digestingizzy wizzy wrote: ↑Mon Jan 04, 2021 8:59 pm You might already have seen this https://www.diyaudio.com/forums/tubes-v ... -pull.html
I found it focusing and reckon it's not far off where I'm headed in terms of topology.