TO3 bushes

bwg · 16th September 2011, 10:51 PM

Am rebuilding a vintage amp. Anyone know where to obtain larger type nylon insulating bushes for TO3 transistors (in UK) which as far as I can remember were standard about 30 years ago. The ones on sale now are too small and nearly disappear through the hole in the heatsink. The ones I am looking for measure approx 9.5mm large diameter while the part that sits through the heat sink is 6.2mm outside diameter and the centre hole through the bush takes a 4BA screw (3.6mm diameter).
Can't find any reference to them on web so worst case may need to improvise.

ArtG · 19th September 2011, 12:12 AM

These may be available from your local distributors it they carry the brand "Eagle Plastic Devices". Look under "screw insulators". Other manufacturers that may have suitable items are RAF, and Keystone Electronics. You may be able to find nylon bushings that are the correct size, but are too long and can be shortened to fit. An alternative could be simply a piece of Teflon tubing that's cut to fit.

nigelwright7557 · 19th September 2011, 12:16 AM

RS Components | Electronic and Electrical Components
world-leading distributor of electronic and maintenance, repair and operations products. | Farnell United Kingdom

You might get away with using a metal washer to take up the slack ?

mickeymoose · 19th September 2011, 12:41 AM

Send me a PM with qty. required and will I mail you some. E

bwg · 21st September 2011, 03:36 PM

Many thanks for replies

16th September 2011, 10:51 PM	#1
bwg diyAudio Member Join Date: Jan 2009	TO3 bushes Am rebuilding a vintage amp. Anyone know where to obtain larger type nylon insulating bushes for TO3 transistors (in UK) which as far as I can remember were standard about 30 years ago. The ones on sale now are too small and nearly disappear through the hole in the heatsink. The ones I am looking for measure approx 9.5mm large diameter while the part that sits through the heat sink is 6.2mm outside diameter and the centre hole through the bush takes a 4BA screw (3.6mm diameter). Can't find any reference to them on web so worst case may need to improvise.

19th September 2011, 12:16 AM	#3
nigelwright7557 diyAudio Member Join Date: Apr 2008 Location: Carlisle, England	RS Components \| Electronic and Electrical Components world-leading distributor of electronic and maintenance, repair and operations products. \| Farnell United Kingdom You might get away with using a metal washer to take up the slack ? __________________ http://www.murtonpikesystems.co.uk PCBCAD40 pcb design software.

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19th September 2011, 12:12 AM	#2
ArtG diyAudio Member Join Date: Nov 2006 Location: Central PA	These may be available from your local distributors it they carry the brand "Eagle Plastic Devices". Look under "screw insulators". Other manufacturers that may have suitable items are RAF, and Keystone Electronics. You may be able to find nylon bushings that are the correct size, but are too long and can be shortened to fit. An alternative could be simply a piece of Teflon tubing that's cut to fit.

19th September 2011, 12:41 AM	#4
mickeymoose diyAudio Member Join Date: Nov 2008	Send me a PM with qty. required and will I mail you some. E

21st September 2011, 03:36 PM	#5
bwg diyAudio Member Join Date: Jan 2009	Many thanks for replies

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