I thought your pair of B-3 running bridged are working. Is this a 3rd one?I have in my posession this wonderful amplifier and am trying to bring it to its former glory.
Looking for some guidance on replacements for the following transistors 2sc1775 and 2sa659 on the muting board. Thank you
Here is the circuit
Awesome stuff,That is really a big drafting mistake on that schematic.
Listing a 2SA for a NPN device.....urgh!!
Then double-erroring it to go from 1775 to 1175.....duh !
As you may have noticed in reality, TR310/304/306 are indeed 2SC1775
By default, 2SA1775(A) is normally subbed by KSC1845 (or 2SC2240)
In case you can't get them, then the next step down are transistors that are rated 50V, such as KSC1815 and KSC945C (note the C suffix for correct leg order)
Voltage-rating-wise (Vce of 2SC1775 ~ 90V), that is not really required for subs in that section there (rail voltage is 50V, with maximum 25V dropping over those transistors).
2SA659 can be subbed by KSA1015
I originally did the 2 big filtering caps, all electrolytics, the double diodes Will do a complete restoration now.I thought your pair of B-3 running bridged are working. Is this a 3rd one?
Just have the 2 original B-3’sI thought your pair of B-3 running bridged are working. Is this a 3rd one?
May take a couple of pics on the way.