Help reading transistor IDs on a blurry SWR schematic.

[Axtman]

Can you please help me identify the following transistors?

Here is what I think that I see:

Q1: MPSA06
Q2: 2N5416
Q3: 2SC4302
Q4: 2SC2837
Q5: TIP29A
Q6: MPSA56
Q7: MPSA56
Q8: 2SC4302
Q9: 2SA1668
Q10: 2SC2837

BTW, I have "repaired" this amp before and it quit working so I cannot trust that I used the correct transistors.

[DrGonz78]

The only one's I can't fully agree with are Q3 and Q8 as you have them 2sc4302. I read them as 2sc4382 instead. If you type in google "2sc4382 complementary pair" you will have a match with SANKEN 2SA1668 & 2SC4382 200V 2A 25W Transistor. That make sense to me that 4382 and 1668 are complementary pairs. Look at the A06 typed font on the schematic and it has a zero then compare all the 8's that could fool you as 0's.

Edit: Also look at another version of that amp. Clearly 2sc4382.

[g1]

Agree on the 2SC4382.
This drawing is mostly the same, a few different parts but uses the 2SC4382 also.

[Enzo]

2SC4382

[Axtman]

See! This is why I keep you guys around.

Thanks.

[Axtman]

FYI Most SWR amps use the infamous Sanken 2SC3264 output transistors. This amp does not.

If I was really industrious I could drill four holes in the chassis and mount two of those output transistors. Would there be any real advantage to doing this modification?

[Enzo]

Prolly not.

By the way, I only have ONE 2SC3264 left in stock. It's real live Sanken, but lonely.

Hmmm, I do have three of the 2SC2837.

[Axtman]

Thanks Enzo but I just ordered parts from DigiKey because I needed a few other components.

[Enzo]

Oh, I am not trying to sell parts, just letting it be known when I have some maybe not so common anymore part.

[Axtman]

I got the amp working. It's amazing what happens when you install the correct parts! ;-)

FYI, even though this amp is an SWR California Blonde, it uses the same circuit topolgy as the Workingman 12 amp.

[Enzo]

SWR used a sort of Mix-N-Match design philosophy. They used some of their standard circuits in multiple models.

[Axtman]

I agree. I have worked on a few SWR amps and they are all basically the same.