WTB: Small qty. TO-3P insulators (US only) - diyAudio
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Old 12th June 2009, 05:19 PM   #1
sonidos is offline sonidos  United States
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Default WTB: Small qty. TO-3P insulators (US only)

Folks, if anyone here in the US has extra TO-3P mica or sil-pad insulators, can you spare 5 pcs? This is about the last thing I need to repair my Adcom amp. Hopefully, someone has extras floating around.

Let me know how much coin to have you part with a few extras in your toolbox.

Thanks!!
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Old 13th June 2009, 08:20 AM   #2
Magura is offline Magura  Denmark
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Hmm, are you sure you don't confuse TO-3P for TO-3 ?

All the Adcom amps I've seen so far, has TO-3 devices.


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Old 13th June 2009, 12:11 PM   #3
infinia is offline infinia  United States
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Quote:
Originally posted by Magura

All the Adcom amps I've seen so far, has TO-3 devices.

Just the big ones. The smaller ones use plastic outputs.
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Old 13th June 2009, 02:45 PM   #4
sonidos is offline sonidos  United States
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Hi Magura,

infinia is correct. I have the Adcom GFA-535. It uses Sanyo 2SD1047 and 2SB817. I appreciate both of you responding. Per the datasheet, TO-3P. The insulators are last on my list....should have checked them more closely after I removed the originals. I ripped a couple so I I'm a couple short.
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Old 13th June 2009, 03:04 PM   #5
infinia is offline infinia  United States
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Quote:
Originally posted by sonidos
Hi Magura,

infinia is correct. I have the Adcom GFA-535. It uses Sanyo 2SD1047 and 2SB817. I appreciate both of you responding. Per the datasheet, TO-3P. The insulators are last on my list....should have checked them more closely after I removed the originals. I ripped a couple so I I'm a couple short.
Hi I have both 535 and 555 series1 !
What are u using for outputs I assume you repaired/replaced. Perhaps a phone call to some local distributor... if nice they can mail you a few.
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Old 13th June 2009, 04:31 PM   #6
sonidos is offline sonidos  United States
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Hi infinia,

I actually designed a new psu board, which kicked all this off. I goofed on the right channel and blew out a couple of transistors. I sourced the same transistors from B & D Enterprises. They have a good collection of Sanyo trannies.

Fortunately, my left channel works and sounds even better. I upped capacitance with Panasonic TS-HAs, put in a pair of rectifiers that have better current capability, removed the wiring to the LED indicators, and replaced many of the resistors in the signal chain with Vishay Dales. Also, the soldering job was horrendous on the boards and I realigned all the pins on the output trannies and cleaned it all up. The left channel sounds like a whole different beast.

I found a seller on ebay from Hong Kong, so today I put in my order. It will take about 2 weeks but he was much cheaper than distributors. He's got a high rating of 99.9% so hopefully I don't run into trouble with the sil-pads he sold me.
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Old 13th June 2009, 05:11 PM   #7
PH104 is offline PH104  United States
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sonidos --

I just saw this thread. Sorry I didn't notice it before. You can buy TO-3P pads, both mica and sil-pads, from Mouser in Mansfield TX. The mica insulators are a dime or so, sil-pads more expensive but you can buy either in onesies.

I can find the parts numbers if your eBay buy doesn't work out.
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Old 13th June 2009, 05:19 PM   #8
sonidos is offline sonidos  United States
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Default Mouser #s

Hi PH104,

Yes, big help if you know the Mouser #'s. I wasn't sure which ones they carry that will work. The Keystone mica insulators seemed close but I wasn't sure. If you could help me with the guesswork, much appreciated.
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Old 13th June 2009, 05:32 PM   #9
PH104 is offline PH104  United States
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It turns out I got the sil-pads from Digi-Key but they will also sell small quantities. It's Digi-Key BER120-ND. The size is 1" x 0.75" for a TO-247 but should work with TO-3P.

The Mouser micas (534-4661) are 1.5" x 1".
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Old 13th June 2009, 05:51 PM   #10
sonidos is offline sonidos  United States
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Great! That just save me a ton of time researching. Many thanks!
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