UK Vintage Radio Repair and Restoration Powered By Google Custom Search Vintage Radio Service Data

Go Back   UK Vintage Radio Repair and Restoration Discussion Forum > Specific Vintage Equipment > Vintage Radio (domestic)

Notices

Vintage Radio (domestic) Domestic vintage radio (wireless) receivers only.

Reply
 
Thread Tools
Old 14th Jun 2018, 6:05 pm   #1
val33vo
Pentode
 
Join Date: Apr 2008
Location: Banffshire, Scotland, UK.
Posts: 187
Default AF11x trannies

Wonder why they had a screen ? they are definately a fault waiting to happen re internal whisker growth , I also suspect they made a small fortune for radio repair shops back in the days when radios were actually sent for repair rather than thrown in the bin
val33vo is offline   Reply With Quote
Old 14th Jun 2018, 6:13 pm   #2
Nuvistor
Dekatron
 
Nuvistor's Avatar
 
Join Date: Aug 2013
Location: Wigan, Greater Manchester, UK.
Posts: 5,506
Default Re: AF11x trannies

We didn’t make that much money repairing them, had to keep repair costs as low as possible or even then they would have been scrapped, but yes I did repair quite a few.

Has for the screening, some were designed for use at VHF, probably as cheap to keep the whole line the same encapsulation. It’s also possible that they were graded when they came off production line for use at different frequencies so the encapsulation would need to be the same.
__________________
Frank
Nuvistor is online now   Reply With Quote
Old 14th Jun 2018, 8:12 pm   #3
AC/HL
Moderator
 
AC/HL's Avatar
 
Join Date: Nov 2003
Location: Heckmondwike, West Yorkshire, UK.
Posts: 6,174
Default Re: AF11x trannies

Hindsight's a wonderful thing. Had they known about whiskering (or for that matter synthetic rubber formulation ageing) in advance...
__________________
Bill, BVWS member
AC/HL is offline   Reply With Quote
Old 15th Jun 2018, 1:28 pm   #4
rambo1152
Heptode
 
rambo1152's Avatar
 
Join Date: May 2010
Location: Manchester, UK.
Posts: 634
Default Re: AF11x trannies

Received wisdom for most of us, is that these new-fangled solid-state devices would last indefinitely, and that has, by and large, proved to be so.

Even if you don't earth the "screen" wire, and leave the metal can floating, the whiskers can still take their toll by growing out from the can to two parts of the crystal, or their internal connections.
__________________
--
Graham.
G3ZVT
rambo1152 is online now   Reply With Quote
Reply

Thread Tools



All times are GMT +1. The time now is 7:32 pm.


All information and advice on this forum is subject to the WARNING AND DISCLAIMER located at https://www.vintage-radio.net/rules.html.
Failure to heed this warning may result in death or serious injury to yourself and/or others.


Powered by vBulletin®
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Copyright ©2002 - 2018, Paul Stenning.