Studio Lead Reverb

[pruid]

I just picked up a 1973 Studio Lead, sweet little SS amp, but it came with the reverb tank removed. I can't seem to find any information on replacement tanks for these amps. Anyone have the specs on these tanks?

[loudthud]

The info I have says it is a OC Electronics Z3C. Sunn Part number 29-0006, same as the one in a Concert Lead.

[pruid]

Thanks for the info Loudthud!

I am having some trouble finding the specs on the OC electronics Z3C in order to find a replacement. Since this amp didnt come with one I can't exactly measure the ohms in/out. I emailed Accutronics (who acquired OC in the 80's) and I'm waiting to hear back from them.

[pruid]

I did find this here on forum under concert lead reverb

the reverb tank model, like yours, is O.C. Electronics P/N 29.0006 Type 51.  The input resistance was about 175Ω and the output resistance was about 173Ω. 

[Watson]

I have two spare Z3C OC tanks but they are type 56 and type 76.  I've tried to find documented specs on these but have not been successful.  As you gather more information, if it should turn out that one of these is usable, feel free to contact me. I would make either available for $35 and shipping.

[pruid]

Thanks Watson! If I find that one of those tanks will work I'll be in touch.

I just got an email back from Accutronics who said they didn't have the specs on the tank and told me to ask the amp manufacturer.

[Watson]

NP.  I tried and tried to find info that would be an effective mapping of OC's tanks to the Accutronics and was not successful.  I haven't anything to install these two units in to get impedance readings.  The best I can do is get you resistance in and out which of course is not quit the same.  Let me know if you get to the point where that would help.

I bought these as working units with the intent of adding them to home-grown projects and never got around to it.  The model 56 was confirmed to be working for sure in August of this year.  The model 76 which was a pull from a working Thomas Organ.

Both were "Manufactured by beautiful girls in Milton WIS under controlled atmospheric conditions"

[pruid]

Upon further review Accutronics (belton) told me "The OC Type 51 is same as accutronics 8FB3A1B"

I also found some more information on tdpri under a post on Alamo amps where Belton says "the OC Electronics Cascade type 251 has a 1475 ohm input impedance and a 2250 ohm output impedance. It has a 3 second delay and the connectors are both grounded. This unit can be replaced with an Accutronics model 8FB3A1B or, if you have the space for a 17” long reverb tank you could go to a 9FB2A1B." http://www.tdpri.com/forum/amp-central-station/246981-figuring-out-reverb-tank-swap-old-alamo-amp.html

I might give the 17" a whirl, see how it sounds.