Hartke B200 schematic

[MarkusBass]

Does anyone have a schematic for this amp? One of the output transistors is shorted. I'd like to check other components in this power amp. I'm looking also for a replacement for D2058 transistor (difficult to purchase in Europe).

Mark

[oc disorder]

I have no schematic maybe you could try here
Sound Service GmbH - European Music Distribution
and there are 87 x 2SD 2058's here
GES GmbH - www.Electronicpool.de - obsolete or hard-to-find electronic components

[MarkusBass]

Thanks. I will contact them but it looks like they have 14.5 Euro delivery fee. This is a little bit too much for one or two transistors.

Mark

[Steve Conner]

I think the TIP31 (A, B or C) should be a reasonable sub for the 2SD2058.

[MarkusBass]

Thanks Steve. I found even closer replacement: 2SD2061. But it's TO220 - with metal tab, while the original was TO220F - plastic. TIP31 is also TO220.

Mark

[oc disorder]

A long shot but I found some 2sd2058's in an Australian catalogue.
Wagner Electronic Services
They are approx $4.40 each australian dollars.
I'm sure they won't charge $30 Au for postage.
Probably send them via Kangaroo long hops !
Send them an email and see if they will ship to you.
There is a downloadable catalog.
Otherwise Mouser etc in the States.

[Jazz P Bass]

TO 220 metal tab

Thanks Steve. I found even closer replacement: 2SD2061. But it's TO220 - with metal tab, while the original was TO220F - plastic. TIP31 is also TO220.

Mark

If you use the metal tab transistor , make sure that you use a mica insulator & a plastic grommet on the mounting screw.

[Enzo]

Contact Samson in New York, they will probably send you the schematic.

[MarkusBass]

I did but so far no answer. Let's give them some more time.

Mark

[MarkusBass]

I've got 2SD2061 transitstors and I found out that they do not have metal tab - it's TO220F package, so it's a direct replacement for 2SD2058. There was incorrect picture in the shop where I ordered the transistors. But I checked also few other transistors in the power amp and it looks like at least three other transistors are either shorted or open: C3198, A1266 and D600. The first two are Korean KSC and KTA but what is the last one? Is it 2SD600? Hard to find in google.

Mark

[Enzo]

K for Korean or 2 for Japanese, doesn;t matter.

2SD600, is a TO126, I believe. 100v, 1 amp 8w. Compliment to a 2SB631

[MarkusBass]

Thanks Enzo. BTW, when are you sleeping?
I managed to find both Korean and Japanese version of the low power transistors but I cannot find 2SD600. This is again a transistor in a package without metal tab. Otherwise most probably I could use BD139 .

Mark

[Enzo]

TO126 package. I bet an MJE243 would work. That has no tab, but does have the hole through it.

B&D shows them in stock B&D Enterprises - electronics, projection lamps for hitachi, sony, mitsubishi, panasonic, samsung
MCM shows them out of stock, expected in 45 days.

I am familiar with the part, I stock them here. Seems to me they are used in the power supply of some cassette decks. DOn;t recall where I last bought them, cassette repairs have slowed down lately...

My shop is open musician hours. We open 6:30PM and go home about dawn. I sleep days.

[Steve Conner]

So what's the problem with using transistors that have metal tabs? Can't you just put insulating washers underneath them?

The plastic packages such as the isolated TO-220F are just for manufacturing convenience: they have a worse thermal resistance to heatsink than a regular TO-220 with a thermal washer. So that could be considered an upgrade.

The TO-126 doesn't have a tab, but it still has a bare metal bit underneath connected to the collector.

[MarkusBass]

It's not a problem. But I always try to fix amp in the way that it is exactly the same as before the failure. Of course I have to balance time and cost. In this case I may use BD139.

Mark