I was hoping someone who has more experience than I could help me out. I came across an old Conn organ and besides having a boat load of 12au7 tubes it basically a stereo amplifier with 12AV6 GT power tubes..Any way I was able to do some simple mods about using it in the bedroom and it sounds good..The transformrest are stamped 1959 it needs recapping can anyone help me with witch and what kind to get..I believe I just need to re place the 3 paper and wax ones with new polarized ones does this sound correct. ...BOB B
4 posters
Recapping a Conn organ amp
rfbro- Posts : 27
Join date : 2014-12-28
Age : 69
Location : Vancouver WA
Bob Latino- Admin
- Posts : 3276
Join date : 2008-11-26
Location : Massachusetts
rfbro wrote:I was hoping someone who has more experience than I could help me out. I came across an old Conn organ and besides having a boat load of 12au7 tubes it basically a stereo amplifier with 12AV6 GT power tubes..Any way I was able to do some simple mods about using it in the bedroom and it sounds good..The transformrest are stamped 1959 it needs recapping can anyone help me with witch and what kind to get..I believe I just need to re place the 3 paper and wax ones with new polarized ones does this sound correct. ...BOB B
Hi Bob,
See if you can post a photo of the inside wiring of this amp. We can take a look at it and maybe recommend some things you can do to the amp to increase its reliability.
Bob
rfbro- Posts : 27
Join date : 2014-12-28
Age : 69
Location : Vancouver WA
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i HOPE I DID THIS RIGHT
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rfbro- Posts : 27
Join date : 2014-12-28
Age : 69
Location : Vancouver WA
I THINK THE 3 PAPER ONES ARE THE ONES I NEED TO CHANGE WITH LIKE VALUES
Bob Latino- Admin
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Join date : 2008-11-26
Location : Massachusetts
rfbro wrote:I THINK THE 3 PAPER ONES ARE THE ONES I NEED TO CHANGE WITH LIKE VALUES
Yes - Change out those 3 paper capacitors .. Later you may want to also replace all those carbon composition resistors with metal film resistors. Carbon composition resistors will usually go UP in value a little after 30+ years. Some of those carbon composition resistors are probably out of spec a little by now ..
Bob
rfbro- Posts : 27
Join date : 2014-12-28
Age : 69
Location : Vancouver WA
thank you very much for the information Bob when I replace those paper capacitors I'm assuming that they have to be with a positive and negative polarized and also do you have a specific brand or should I just get a RadioShack
Bob Latino- Admin
- Posts : 3276
Join date : 2008-11-26
Location : Massachusetts
rfbro wrote:thank you very much for the information Bob when I replace those paper capacitors I'm assuming that they have to be with a positive and negative polarized and also do you have a specific brand or should I just get a RadioShack
Yes - Those paper caps all appear to be electrolytic caps which do have a + and a - side .. RadioShack may have something you can use. Just write down the capacitance and the voltage rating of each cap and replace it with something the same or just a little larger .. Going up in value maybe up to 50% larger on the capacitance would be OK. One of those caps appears to be a 450 volt cap. Just make sure that the voltage rating of all the caps are at least as high as what is in there now.
Bob
Roy Mottram- Admin
- Posts : 1838
Join date : 2008-11-30
you should be able to find replacements for those 3 caps here: https://www.tubesandmore.com/products/capacitors?filters=Brand%3DGeneric%2CType%3DElectrolytic
wildiowa- Posts : 237
Join date : 2012-03-19
I dug a similar amp out of an old Gulbransen organ, mono, two 6L6's. Made a guitar amp out of it, it was my first refurb project they are easy to work on lots of room and usually only need new caps as noted above. Hand wired in Chicago, IL. Most transformers etc. are very heavy duty as they used them to drive other stuff in the old organs not sure what but it was a killer guitar amp...have fun.