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Hoffman Amps Forum image Author Topic: VHT special six ultra push/pull volume pot replacement  (Read 266 times)

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Offline dsones

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VHT special six ultra push/pull volume pot replacement
« on: November 17, 2025, 11:35:43 am »
I have two VHT Special Six Ultra amps. In one amp the push/pull volume pot is shorting so I need to replace the pot. The pot is not like a standard DPDT pot. Do you know what kind of push/pull volume pot I need. When the switch is in the push position B, C, E, F all have continuity with each other. In the pull position A, D, B, E all have continuity. Also lugs A and D are not connected too any thing.  This is very different from the push/pull switches I’m use to (like the picture). What am I missing?

Offline danhei

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Re: VHT special six ultra push/pull volume pot replacement
« Reply #1 on: November 17, 2025, 11:41:00 pm »
If B and E are always connected couldn’t you use a standard DPDT pot and jumper across B and E? And are you measuring the connections in-circuit or with the pot removed?

Offline kagliostro

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Re: VHT special six ultra push/pull volume pot replacement
« Reply #2 on: November 18, 2025, 03:02:52 am »
https://robrobinette.com/Special6UltraMod.htm

Looking to the schematic seems that the PP Pot switchs were simply connected in parallel as to perform a DPST from a DPDT

Franco
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