Hi,
I have restored an old Kenwood KA-32 amplifier and is working fine now. There is still an issue with loose contact in the gang-ed push button switches.
It is a set of three 4PDT switches attached together. I need to replace the set.
Can anyone let me know which online international or US store sells that part?
Thanks in advance.
-Raj.
I have restored an old Kenwood KA-32 amplifier and is working fine now. There is still an issue with loose contact in the gang-ed push button switches.
It is a set of three 4PDT switches attached together. I need to replace the set.
Can anyone let me know which online international or US store sells that part?
Thanks in advance.
-Raj.
Did you consider setting up a bank of relays to get the required number of poles, then using a simple SPST switch to activate the relays? Hopefully you won't have trouble finding a power source for the relays inside the amp.
These are getting really scarce. One brand of miniature 4PDT toggle switches was C&K, but don't know if anybody stocks this line.
The modern way to do that is analog switch IC's, cmos based, with a spst throw switch (or microprocessor) as the control. The Cheap high resistance ones are CD4016 or CD4066. The more expensive lower resistance versions are made by TI or maxim? in SMD parts, The mouser catalog has a good review of analog switches, say page 340 in catalog 644 (available on line).
I'm looking for 16 pole 16 throw switches myself for the organ. 1/4 ohm would be nice but 3 ohm (TI parts) would do with op amps in and out. Don't know how to search the internet for a PWB like this: suspect I'll have to make a dozen or so. I don't know how to work SMD parts, leaves me back with 4016-4066 DIP analog switches, for sure. As a fall back I have cornered the market on rhodium plated 4PDT bifurcated contact relays, stocking 100 of them. there are video crosspoint network ICs, but don't know if the isolation of these exotic SMD beasts would be sufficient for a Hammond organ.
The modern way to do that is analog switch IC's, cmos based, with a spst throw switch (or microprocessor) as the control. The Cheap high resistance ones are CD4016 or CD4066. The more expensive lower resistance versions are made by TI or maxim? in SMD parts, The mouser catalog has a good review of analog switches, say page 340 in catalog 644 (available on line).
I'm looking for 16 pole 16 throw switches myself for the organ. 1/4 ohm would be nice but 3 ohm (TI parts) would do with op amps in and out. Don't know how to search the internet for a PWB like this: suspect I'll have to make a dozen or so. I don't know how to work SMD parts, leaves me back with 4016-4066 DIP analog switches, for sure. As a fall back I have cornered the market on rhodium plated 4PDT bifurcated contact relays, stocking 100 of them. there are video crosspoint network ICs, but don't know if the isolation of these exotic SMD beasts would be sufficient for a Hammond organ.
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