Here is my headpfone ampje with 4 ECL82 tubes and one 6N2PEV
Because my tranformers are small the come from tv sets philips K8
I decided make two tubes parallel to each other so each side has two pentodes single end.
Because my tranformers are small the come from tv sets philips K8
I decided make two tubes parallel to each other so each side has two pentodes single end.
Interesting design. Rather complicated paralleling two output transformers, but I see the logic in doing so.
One thing I do not see is a balance pot for the two parallel output tubes, which I think will be important if the Gm of the tubes is not well matched. This could be avoided if the tubes were in parallel instead of the output of the transformers being in parallel. I expect the transformers wouldn't handle the higher DC bias current, so you paralleled the transformers.
One thing I do not see is a balance pot for the two parallel output tubes, which I think will be important if the Gm of the tubes is not well matched. This could be avoided if the tubes were in parallel instead of the output of the transformers being in parallel. I expect the transformers wouldn't handle the higher DC bias current, so you paralleled the transformers.
In the old tube based color tv the used the PCL86
The bias is set with the 4 trimmers VR1 VR2 left channel and VR102 VR103 for the richt channel.
I have set this on 27 Ma a tube
Here is my setup
As you can see i have chosen for the tubes to be protected so you can't tatch the tubes
The bias is set with the 4 trimmers VR1 VR2 left channel and VR102 VR103 for the richt channel.
I have set this on 27 Ma a tube
Here is my setup
As you can see i have chosen for the tubes to be protected so you can't tatch the tubes
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