VintageKustom.com: Repairing Kustom Amps » Tantalum Capacitors sub w/ Aluminum Electrolytics?

Re: Tantalum Capacitors sub w/ Aluminum Electrolytics? [message #26436 is a reply to message #26433]

Wed, 13 December 2017 11:31

polaris26
Messages: 6
Registered: December 2017
Location: PA, USA

Junior Member

Hi stevem,

Just to be clear, I wasn't trying to associate the offset with the caps necessarily; I only mentioned the offset issue in this thread because chicagobill had asked if there was some issue with the amp, or was I recapping just for the sake of recapping. I almost never have 'bench time' on weekdays due to my day job, so hopefully this weekend I will get to the bottom of that issue either way.

As an aside (probably for another thread), I hope the transistors are ok, because they are just at that vintage where finding proper subs is a little challenging.
After some cursory research, I came up with 2N3019/2N4033 for the TO-39 w/ heat sink drivers, MJ15003 for the outputs, 2N3563/PN3563 for the PET1075 VAS, 2N4401/4403 for the protection circuit, and some nice quiet KSA992BFU for the 2N4249 PNP differential input stage. Recently, I used a pair of KSA992BFU that I sort-of "matched" with my Peak Atlas DCA75pro in a similar amp repair (EMC Sagittarius) that I did a few weeks ago. The EMC power amp section is very similar to the Kustom design, perhaps even a bit more primitive. The KSA992BFU worked well on the 'front end', and really brought the offset down to a few mV in that case. But, if I get more into the semiconductors I should probably start a new thread for that.

Thanks again everyone for your input RE: caps - always appreciated!

Regards,
Dave

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