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Caps in my 1963 Gibson ga 8t Discover

raildog

Member
Messages
379
I have 4 electrolytic caps in my amp 3 mallory 20 mfd 450 vdc and 1 500vdc, are these the correct caps for this amp, the 500 is connected to the volume, thanks as always,Scott
 

WaltC

Member
Messages
2,129
They *look* OK, but looks can be deceiving. Is the amp quiet? Do you get a loud 60hz hum? If the amp is quiet and no low level 60hz hum then these electrolytics are probably fine. FWIW the cap "attached to the volume pot" isn't *really* attached to the pot for any volume-related reason, it's just attached there as a convenient place to solder the ground (-) side of the electrolytic to chassis ground.

Again, FWIW, your Discoverer looks pretty good inside compared to the ones I've worked on (15 or so GA-8T EL-84 Discoverer's at this point).
 

raildog

Member
Messages
379
Walt, Thanks for the info, i may just do the power cord and see how she sounds, it didn't have any noise but for the 15 watts i thought it would have been louder, maybe the ot needs changing.Scott
 

skeeterbuck

Member
Messages
1,668
This pic is a perfect example of point to point wiring. NO BOARD in the layout.
So many think that any handwired amp is PTP which just isn't so.
 

capnjuan

Member
Messages
98
... and 1 500vdc, are these the correct caps for this amp, the 500 is connected to the volume, thanks as always,Scott
Hi Scott; yes ... the cap that's 'connected to the volume' is only grounded on the body of the control; it has nothing to do with volume; the cap is the preamp cathode bypass cap around the 1.5K cathode resistor. If you replace the primary filter caps, replace that bypass cap too. John
 

raildog

Member
Messages
379
I was trying to check how much electricity was in my caps and not really sure how to, I placed my multi meter on dcv and the 500 setting touched the black lead to the chassis and the red probe to the positive end of the cap, no reading, what am i doing in correct? thanks,Scott
 

slider313

Gold Supporting Member
Messages
8,252
If that was my amp I would replace all the electrolytics. These amps seem to "bloom" after 7 on the volume knob. That's when they thicken up and you get some volume out of them. They can sound thin with low output under 7. Even dimed they aren't overly loud but between 7-10 is where I used to keep mine, and I used it at blues jams and it cut through the mix.
 

Trout

Member
Messages
7,551
I have 4 electrolytic caps in my amp 3 mallory 20 mfd 450 vdc and 1 500vdc, are these the correct caps for this amp, the 500 is connected to the volume, thanks as always,Scott
If it were mine, I would swap out the 4 Metal caps with FT Brand simply because they are similar in physical size, the have nice long leads, and having used hundreds of them, very reliable.

I would also replace the little black electrolytic bypass cap near the center of the chassis.

I would also get a 3 prong power cord on there.
 

TNO

Member
Messages
1,003
The filter caps were originallly 20-10-10 uF. Three 20s will work fine but The preamp sound more "open" with the 10s. I like Nichicons for their smaller size. The very cheap filters from WeberVST work fine and are very compact.
 




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