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Old 11th July 2020, 11:49 PM   #9621
6A3sUMMER is offline 6A3sUMMER  United States
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A separate thread would be nice (and lots of work).
Do share.

Nice hybrid, and nice idea to drive an interstage from both ends.
I am curious.

"Tu-Be or not Tu-Be, that is the question" - stolen from Shakespeare, and modified.
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Old 11th July 2020, 11:51 PM   #9622
Radiola is offline Radiola  Canada
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And forgot to mention that my excuse to post it here is the circuit is indeed a tube one - I believe 6C18C could go in instead, for example.
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Old Yesterday, 12:01 AM   #9623
planet10 is offline planet10  Canada
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please. And post the link here so all interested can follow.

dave
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Old Yesterday, 12:07 AM   #9624
Radiola is offline Radiola  Canada
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Quote:
Originally Posted by 6A3sUMMER View Post
A separate thread would be nice (and lots of work).
Do share.
Gents, I am not that skilled in managing discussion threads and I need to learn a few things so please give me some time to figure it out.

Here is the amplifier circuit, just in case. The SIT is KP802A. The trick is this thing is nowhere close to what is published in the datasheet (it even got the pinout wrong...). I am adding measured curves for one of the devices which is inside. The tube is 6N6P.
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File Type: jpg Mriya PP circuit.jpg (365.1 KB, 198 views)
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Old Yesterday, 12:15 AM   #9625
Radiola is offline Radiola  Canada
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A few resistors ended up adjusted for value during debugging and listening. No measurements have been done yet except the max power at 8Ohm - app. 25W and I checked that nothing wrong happens when it is clipping, attached.

Output transformer - Toroidy, the one for 6C33C.
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Old Yesterday, 12:30 AM   #9626
Radiola is offline Radiola  Canada
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The Mriya SE amplifier which I got in the picture a few posts earlier is using a single KP802A as both the gain stage and the transformer driver. From a single stage circuit like that app. 7W of output power could be delivered.
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Old Yesterday, 12:51 AM   #9627
prairieboy is offline prairieboy  Canada
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Quote:
Originally Posted by Bas Horneman View Post
My Baby Huey PP EL84
Nice work. A bit of quarter cut oak looks great over the trannies.
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Old Yesterday, 04:23 AM   #9628
Radiola is offline Radiola  Canada
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As suggested, I created a thread for details of the SIT push-pull amplifier project. I am not sure if it is the right way of doing it but here is the link.
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Old Yesterday, 03:07 PM   #9629
GUNFU is offline GUNFU  Russian Federation
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Quote:
Originally Posted by Airhead View Post
I made EL34 class A push pull amp, nothing fancy. Basic Audio Innovations schematic with some modifications.
Is this case from an old appliance? Or purchased separately?
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Originally Posted by alex mm View Post
Today, have finished, inside connections, tests will follow soon ! Thanks , no, toroidal are factory made .
Are these transformers manufactured in Romania?
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Last edited by GUNFU; Yesterday at 03:22 PM.
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