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Old 23rd January 2011, 10:42 PM   #121
johnm is offline johnm  United Kingdom
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How it looked originally, minus the missing transistor clamp which I'll be creating this week:

Click the image to open in full size.

And a shot from someone else's amp with the clamp in place:

Click the image to open in full size.

Last edited by johnm; 23rd January 2011 at 10:45 PM.
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Old 24th January 2011, 02:50 AM   #122
jaycee is offline jaycee  United Kingdom
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Now i see. The silver pads under the transistors are metal inserts. What an odd way of doing it. TO-3P pads definitely big enough i reckon.
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Old 24th January 2011, 07:24 AM   #123
Mooly is online now Mooly  United Kingdom
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Have a look at these,
BERGQUIST|3223-07FR-104NH|THERMAL PAD, TO-3P | Farnell United Kingdom

You really need them without the hole (like these) and TO3P are larger than T0220
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Old 24th January 2011, 07:30 AM   #124
Mooly is online now Mooly  United Kingdom
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Quote:
Originally Posted by jaycee View Post
Now i see. The silver pads under the transistors are metal inserts. What an odd way of doing it. TO-3P pads definitely big enough i reckon.
It's typical of the era... allows the transistors to fit flush with the pcb rather than having to preform the legs to inset them to touch the heatsink. Cost and weird ways of doing things was no object back then. All wonderfully screwed together gear.
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Old 24th January 2011, 08:54 AM   #125
johnm is offline johnm  United Kingdom
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"Have a look at these,
BERGQUIST|3223-07FR-104NH|THERMAL PAD, TO-3P | Farnell United Kingdom "


Thanks for that link Mooly - they look just the ticket!

Unfortunately the minimum order is annoyingly 20 on Farnell when paying by card and I maxed out my spending this month on the transistors/capacitors for this project on my last Farnell order.

I don't suppose anyone could piggyback 4 of these pads onto their next order? Cheeky request I know! These minimum order rules are a PITA!

- John

EDIT: They appear to do them here too - I'll look into their minimum order pricing:

http://www.rapidonline.com/Electroni...ource=googleps

Last edited by johnm; 24th January 2011 at 09:03 AM.
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Old 24th January 2011, 09:37 AM   #126
johnm is offline johnm  United Kingdom
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Managed to order via Rapid without any tedious joining up screens to fill in. 12 for 4 pads & delivery... expensive but not as bad as RS or Farnell.

Rapid Electronics - Electronic Components
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Old 24th January 2011, 11:24 AM   #127
Mooly is online now Mooly  United Kingdom
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Same ones aren't they. Is the price per pack of 10 ? Just wondered what will turn up

See they do a sheet of the stuff too. Useful to know as getting many items is becoming more difficult.
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Old 24th January 2011, 05:29 PM   #128
johnm is offline johnm  United Kingdom
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Haha damn if I'd known about that sheet I'd have got that instead (better value for money). Ah well too late now. Ordered the T0-P3s so hope they'll be fine. Might be a bit fiddly to place as they're not adhesive, and - unlike the original large silpad - there won't be any parts that protrude through the pads from the die-cast block which helped to keep the original in place until everything was screwed down.

- J
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Old 24th January 2011, 05:51 PM   #129
Mooly is online now Mooly  United Kingdom
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Maybe a tiny dab of something just to tack it... pin head sized... even heatsink compound. Wouldn't use most glues as it would be too uneven.
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Old 27th January 2011, 10:15 PM   #130
johnm is offline johnm  United Kingdom
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Quote:
Originally Posted by Mooly View Post
Maybe a tiny dab of something just to tack it... pin head sized... even heatsink compound. Wouldn't use most glues as it would be too uneven.
I sent the pads back to Rapid Electronics in the end and instead ordered that 12" x 12" sheet which (I hope) will be arriving tomorrow. Thought I'd best stick with the same size/shape insulating pad as the original (which I'll use as a template) plus its easier to handle/position.

This pesky illess had meant I haven't done anything at all to the amp this week, but I'm hoping I'll be able to make more progress again over the weekend.

- John
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