I just got a marshall 9004 SS preamp from a guy for almost nothing. The only problem is that there are three broken switches. I don't think i can fix them because the really small metal contacts are bent and I dont think i can fix them. Has anyone worked with these types of switches before? I was hoping someone could tell me if there is a place to possibly order replacements. Thanks! 🙂
That's just a 4 way change over switch - common as muck. You just need to specify latching or momentary action.
Super new at doing this stuff so thanks! How do I tell the difference? Just physically? also do you know a good place to order them?
Here's one on E-Bay 221251310816.
The latching variant usually has a spring latch at the front so that each time you press it it changes state. Interlocking switches are usually momentary with a "latching bar". In your application, a single switch on its own would normally be "latching".
The latching variant usually has a spring latch at the front so that each time you press it it changes state. Interlocking switches are usually momentary with a "latching bar". In your application, a single switch on its own would normally be "latching".
Also, there is one switch like the one in the picture, then two that are half the size. I'm having trouble finding any replacements online
They used to be used a lot in old stereos for program selection, might be worth a trip to the thrift shop.
Looks like I'm wrong, they used to be very common but I've been trawling the net and it seems that technology has moved on.
No problem.
If you look at the bits that are left you have 4 groups of three pins. The centre pin of each group is the output of the switch, the other two are the two inputs.
If you can't get a 4 Pole DPDT switch you could use relays with a single ON/OFF switch on the front panel. The relays would replace the broken switch, operated by the front panel switch.
If you cant get a 4 P DPDT relay you could always use 2 x 2 P DPDT relays.
No problem.
If you look at the bits that are left you have 4 groups of three pins. The centre pin of each group is the output of the switch, the other two are the two inputs.
If you can't get a 4 Pole DPDT switch you could use relays with a single ON/OFF switch on the front panel. The relays would replace the broken switch, operated by the front panel switch.
If you cant get a 4 P DPDT relay you could always use 2 x 2 P DPDT relays.
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I found this on ebay for the larger switch
Latching Push Button Switch 4PDT PCB Mounting | eBay
and these for the two smaller ones. (I posted the picture of one of them at the bottom)
10 Pcs Self Lock Latching Uni Direction PCB Push Button Switch DPDT 6 Pin -in Other Switches from Electrical Equipment & Supplies on Aliexpress.com
These should work, correct?
Latching Push Button Switch 4PDT PCB Mounting | eBay
and these for the two smaller ones. (I posted the picture of one of them at the bottom)
10 Pcs Self Lock Latching Uni Direction PCB Push Button Switch DPDT 6 Pin -in Other Switches from Electrical Equipment & Supplies on Aliexpress.com
These should work, correct?
Latching means it stays in whichever state you set. The other type is momentary, which means it is only "on" while you hold it in. Switches used for selector duty - such as in for channel A and out for channel B will be latching types.
Short ones and long ones are DPDT and 4PDT. They should still be quite common, though they do come in differing physical sizes, yours are smaller ones.
Your first link, the ebay 4PDT is larger than yours, it won't fit. The second one DPDT in lots of 10 MIGHT fit, though you'd have to clip off the metal corner posts.
Here is one source for the smaller DPDT:
Switch - Marshall, SW DPDT Push PC Mount | Antique Electronic Supply
Parts Is Parts - Guitar, Amplifier, and Korg Keyboard Parts | AUTHORIZED NATIONAL PARTS DISTRIBUTOR FOR KORG, VOX, BLACKSTAR. PARTS FOR FENDER, GIBSON, GRETSCH, HOFNER, SWR, GUILD... might come up with them, ask them.
I found the DPDT in MOuser:http://www.mouser.com/ProductDetail/ALPS/SPUJ193700/?qs=sGAEpiMZZMvxtGF7dlGNpqhXj64OBKI8GdpZykOXyNY=
A little more looking would probably find the 4PDT too.
Short ones and long ones are DPDT and 4PDT. They should still be quite common, though they do come in differing physical sizes, yours are smaller ones.
Your first link, the ebay 4PDT is larger than yours, it won't fit. The second one DPDT in lots of 10 MIGHT fit, though you'd have to clip off the metal corner posts.
Here is one source for the smaller DPDT:
Switch - Marshall, SW DPDT Push PC Mount | Antique Electronic Supply
Parts Is Parts - Guitar, Amplifier, and Korg Keyboard Parts | AUTHORIZED NATIONAL PARTS DISTRIBUTOR FOR KORG, VOX, BLACKSTAR. PARTS FOR FENDER, GIBSON, GRETSCH, HOFNER, SWR, GUILD... might come up with them, ask them.
I found the DPDT in MOuser:http://www.mouser.com/ProductDetail/ALPS/SPUJ193700/?qs=sGAEpiMZZMvxtGF7dlGNpqhXj64OBKI8GdpZykOXyNY=
A little more looking would probably find the 4PDT too.
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