OT wiring question

[catalin gramada]

Hi. I have two Hammonds 1650R. Both ringing unacceptable over 4 kc. arround so have to snubbing somehow. My question regards the acceptable position of snubbing networks, meant series RC over each primary winding. So, is better to place it close to transformer and run long twisted wires then to the sockets or to run the OT wires to the sockets and place the components in near socket proximity(meant long wire to the B+ aso)? What do you think, please? Thanks
My first thought was to supres it close to the source (even inside the end bells) but maybe is wrong...

[Tom Phillips]

Hi. I have two Hammonds 1650R. Both ringing unacceptable over 4 kc...

It appears that you are assuming that the ringing is due specifically to the transformers. Is that correct? IF the transformers are bad then why not return them to the source? Otherwise, consider that something else is happening in the circuitry / lead dress in the amplifier that should be addressed. would do that and then use snubbing networks as a last ditch effort patch rather as the primary fix.
Something to consider anyway,
Tom

[catalin gramada]

I don.t define as bad, as time it can be used, just found low quality performances for the pieces I buy it. I bought same transformers in past and performed very decent I know they can do it better than the last two junks. But have to live with this and try to "upgrade" a little bit

[Gingertube]

If you are using Ultralinear mode then the RC series network goes between anode and screen connection of the output tube.
If pentode connection then from anode to 0V from each output tube.

I would however be checking other things first. The 1650R self resonances are a.bove 60kHz Make sure you have screen stop resistors and grid stop resistors fitted before looking elsewhere.

Cheers,
Ian

[catalin gramada]

Hi. I know should be nice trannies, I didn.t worked at home. I suspect my improvised dummy load. I grabed few cement resistors and improvised a series/parallel think terrible inductive load, have to check tommorow , thanks for help.

[pdf64]

If there is one, consider the possibility that the feedback loop polarity is positive.