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 Test Gear and Workshop Equipment

Notices

Vintage Test Gear and Workshop Equipment For discussions about vintage test gear and workshop equipment such as coil winders.

Reply
 
Thread Tools
Old 3rd Jun 2020, 10:31 am   #21
G3PIJpeter
Pentode
 
Join Date: Nov 2011
Location: Chippenham, Wiltshire, UK.
Posts: 185
Default Re: Valve testers and E88CC / ECC88 valves

Quote:
Originally Posted by factory View Post
Could that batch be mislabelled?
David
Early on in this saga, I suspected the same and inspected the inside of one of the CV2492s with a x10 hand lens. Each of the pins was connected to the appropriate electrode.

The batch of ten was removed from a 1970s MOD signal generator sub-unit. It might be that they had had a hard life, even though their getters and external condition appeared pristine. All the other examples of E88CC and ECC88 that I have test OK for both triode sections.

Either these CV2492s are a duff lot or they do not have the same electrical characteristics as E88CCs (the commercial equivalent is given as E88CC/01). It might be possible, as suggested before, that these CV2492s give parasitic oscilation on the A2 side. I suppose the real test would be to put one into a working piece of equipment usually fitted with an E88CC - such as a 1950s state-of-the-art 2-metre convertor.

Many thanks for people's continuing suggestions.

- Peter
G3PIJpeter is offline   Reply With Quote
Old 6th Jun 2020, 9:45 am   #22
John_BS
Octode
 
Join Date: Dec 2008
Location: Wincanton, Somerset, UK.
Posts: 1,111
Default Re: Valve testers and E88CC / ECC88 valves

What would happen if you connectd the screen to the cathode? i.e. pin 9 to selector 2?
John_BS is offline   Reply With Quote
Reply

Thread Tools



All times are GMT +1. The time now is 12:07 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 - 2020, vBulletin Solutions, Inc.
Copyright ©2002 - 2020, Paul Stenning.