Shields vs. no shields in Hammond and Leslie amplifiers

[jwhite1362]

Which tubes in Hammond and Leslie amps should be shielded and which tubes shouldn't be shielded?

[geoffbrown]

My experience has been that none of the tubes require shielding and I'm sure my C3 and other hammonds I own are no different anyone else's
The Leslie's have no shielding, same with the PR40 tone cabinet, no hum problem present on my equipment and I place the hammond to speaker cables anyway I like, still no hum,

There has recently been several new threads on this forum relating to hum developing in hammonds with the cause in most cases, failing filter capacitors or dirty tube pins!

[David Anderson]

If we're talking the AO28 preamp, I think the tubes that should be shielded are shielded -- with one exception. I think V5, the 6C4 in the percussion audio signal path, should have been shielded.

Leslies are low-gain power amps, so no shielding is required.

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If we're talking the AO28 preamp, I think the tubes that should be shielded are shielded -- with one exception. I think V5, the 6C4 in the percussion audio signal path, should have been shielded.

Leslies are low-gain power amps, so no shielding is required.

[geoffbrown]

The 12ax7 in the c3 preamp has a shield which can be removed and no hum develops