D735 and B699 Transistor Replacement

[Paul Farria]

These strange batwing transistors are inside of a Bose 551 that I am restoring. I understand I'll have to drill new holes for modern transistors since those batwing case styles were short lived; however, what would be the best modern transistor replacement for the D735 and B699?

 

[cademan]

There is a replacement that will work where you don't need to drill any extra holes. There was thread around here recently on this exact same subject. Let me see if I can find it. My search skills around here are pretty nill.

EDIT: Found it!

Pioneer SA-9500 II should I get it? Any good? | Audiokarma Home Audio Stereo Discussion Forums

 

[Paul Farria]

Thanks, the only issue is the transistor on that post seems to be rated at 80w whereas these in the Bose are 100w.

There is a replacement that will work where you don't need to drill any extra holes. There was thread around here recently on this exact same subject. Let me see if I can find it. My search skills around here are pretty nill.

EDIT: Found it!

Pioneer SA-9500 II should I get it? Any good? | Audiokarma Home Audio Stereo Discussion Forums

 

[cademan]

It's not the transistor number itself you were asking about, but the modern day case style you were asking about for what would be able to take the place of the batwing types and now I see I forgot to tell you what that was. I believe what you want is a type TO-3P(N). These will take the place of the old batwing style. Now you just have to find the equivalent cross number for yours.

You want to find a cross of a case type TO-3P(N) for the numbers (2S)D735 and (2S)B699.

 

[gadget73]

looks like the ones used in that Pioneer are obsolete now anyway.

Probably a 2SA1943 and a 2SC5200 will do though.

 

[Bose newbie]

looks like the ones used in that Pioneer are obsolete now anyway.

Probably a 2SA1943 and a 2SC5200 will do though.

RS Components still sells these; hopefully they are a good replacement. I just ordered a few; their specs look good.