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

Go Back   UK Vintage Radio Repair and Restoration Discussion Forum > Specific Vintage Equipment > Vintage Test Gear and Workshop Equipment


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

Thread Tools
Old 9th Apr 2024, 7:32 pm   #1
LA9CHA Thorvald
Join Date: Dec 2019
Location: Egersund, Norway
Posts: 208
Default Defective Avo vcm 163 gm meter substitution

Hello again, I have a avo vcm 163 that needs a replacement gm meter. My plan is to use an op-amp amplifier pcb, using the original input signal from the vcm to the meter and use a 100uA meter. I think the op-amp input circuit must be similar to the gm meter load resistance (I beleave about 1,5Kohm but is not sure as the meter coil is broken an can not be neasured. Are there any precaution regarding the output from the op-amp driving a replacement meter? I have a circuit (maybe made by Martin, Decatron), and I have earlier made a replacement for the ma/v meter on a avo mk3. So far this has worket out fine. Hints and advices are most welcome!
LA9CHA Thorvald is offline   Reply With Quote

Thread Tools

All times are GMT +1. The time now is 4:52 pm.

All information and advice on this forum is subject to the WARNING AND DISCLAIMER located at
Failure to heed this warning may result in death or serious injury to yourself and/or others.

Powered by vBulletin®
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Copyright ©2002 - 2023, Paul Stenning.