Jazz chorus output trannies dead

[saddleworth]

I have a Roland Jazz Chorus which is great apart from all 4 o/p transistors are blown. I am finding it really hard to find a good equivalent to them they are
2SD736A..they have a small Aluminium heat sink as part of the transistor .
Can anyone help ? I have found one place in the US with a few of the originals but they are astonomical in price.......time to throw the amp away or what ? I am in the U.K.

[Don Moose]

I got this entry from a googling:

Discrete Transistor Characteristics - 2SD Numbers
2SD734, NPN Si, SS, trans. 20V, 700mA, 650mW, 60-560, ~250 MHz, TO92 SC43 2003A. 2SD736A, NPN Si, power, trans. 160V, 12A, 100W, 60-200, -25 MHz ...
http://www.classiccmp.org/rtellason/...stors-2sd.html - 277k - Cached - Similar pages

If correct, that should be enough to find a parametrically acceptable sub. The package drawing I saw was a bit funky - sort of a TO-220 with wings (left and right) rather than a tab. That might be hard to cross.

The link didn't load for me, FWIW.

[oc disorder]

Sanken 2SC2921 The mounting holes line up with the "batwing" Hitachi.
You will only need longer mounting bolts as they are thicker.
Beware of counterfeits...
http://sound.westhost.com/fake/counterfeit-p2.htm
although its the 2922 that got forged.
Oh and you will need new mica washers too
Good luck !

[Enzo]

I have had good luck so far with B&D Enterprises for my Sankens. www.bdent.com

I have also so far gotten real Sankens through MCM. www.mcminone.com

[saddleworth]

Many thanks to all you three guys ( ! ) for such a quick response ! I'm on the case..let's hope I can get the old Roly going again ! I'll see if I can source in the UK first as the Pound Sterling has been dropping off the scale recently !!

[saddleworth]

Trannies for Jazz Chorus.again ! I've just found out a local store has 2SC2922 genuine Sanken in stock...would you happen to know if these too different from the 2921 to use ?Thanks again.

[Enzo]

Look up the datasheets and compare them.

[oc disorder]

Here you go

[Enzo]

Looks like a good sub to me then.

[saddleworth]

Looks like the 2922 is a better performer generally from what I can tell from the figures...there are several options available which I think are gain choices...
the 2SC2922Yis the easiest to get hold of and seems to cover the 2921's gain range..but then again ,what do I know !! I think it's time to bite the bullet and buy some devices.
Many thanks again to you all for taking time to help out .