Re: Heat sink for T)-220 transistors for G08 monitors?

On 10/01/2013 7:06 PM, Zitt Zitterkopf wrote:
> right. IIRC; the heatsink solders to a unconnected pad for mechanical
> stability (and I use that term very loosely)
>
"Groan," said Tom painfully.

John ;-#)#
> *From:* Jonathan Koolpe <mailto:jkoolpe@hotmail.com>
> *Sent:* Tuesday, October 01, 2013 2:09 PM
> *To:* vectorlist@vectorlist.org <mailto:vectorlist@vectorlist.org>
> *Subject:* RE: VECTOR: Heat sink for T)-220 transistors for G08 monitors?
> Got it...forgive my ignorance :) .
>
> I'll check the solder mask on the bottom of the board when I get home,
> but I'm thinking that that pin that solders to the board may just be
> to stabilize the heat sink :) . If true, then I imagine any heat sink
> that fits the TO-202 packaging would suffice.
>
> Jon
>
> ------------------------------------------------------------------------
> Date: Tue, 1 Oct 2013 13:41:20 -0500
> Subject: RE: VECTOR: Heat sink for T)-220 transistors for G08 monitors?
> From: rlboots2@gmail.com
> To: vectorlist@vectorlist.org
>
> Heatsink, unless isolated from the tab, would be connected to the
> collector inside the transistor. This will NEVER be grounded on a
> monitor.
>
> On Oct 1, 2013 1:07 PM, "Jonathan Koolpe" <jkoolpe@hotmail.com
> <mailto:jkoolpe@hotmail.com>> wrote:
>
> Oops...my mistake...I did mean for the TO-202 style :) .
>
> So is the pin from the heat sink that solders to the G08
> deflection board not for ground then?
>
> Jon
>
> ------------------------------------------------------------------------
> Date: Tue, 1 Oct 2013 13:01:48 -0500
> Subject: Re: VECTOR: Heat sink for T)-220 transistors for G08
> monitors?
> From: rlboots2@gmail.com <mailto:rlboots2@gmail.com>
> To: vectorlist@vectorlist.org <mailto:vectorlist@vectorlist.org>
>
> No, don't connect the heatsinks. And make sure you get the right
> heatsink, the old MPSU style transistors were TO-202.
>
> On Oct 1, 2013 12:55 PM, "Jonathan Koolpe" <jkoolpe@hotmail.com
> <mailto:jkoolpe@hotmail.com>> wrote:
>
> Hey all!
>
> I just picked up some G08 boards that I'm hoping to restore so
> I can get a second G08 I have back running...I know...a tall
> order! :)
>
> One of the deflection boards is missing all of the TO-220
> transistors for the P600 circuit. I have the NTE replacements
> at the ready, but no extras of the foil/heat-sink assembly
> that attach to these transistors. Is there a good source for
> replacements for these heat sinks?
>
> And do they need to be grounded as I think they were in the
> original board configuration (as they were shaped such that
> they would fit over the metal top of the transistor and then
> the bottom could be soldered to the board directly via a hole
> that, once soldered, connected to a ground point)?
>
> Thanks,
>
> Jonathan
>
>
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-- 
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