Yarland FV-34CIII - cost me 99p plus £149 postage - 15 years ago -blown ac transformer -
worth selling parts - any hope of resurection?
how can i tell which one is blown - they dont look damaged
worth selling parts - any hope of resurection?
how can i tell which one is blown - they dont look damaged
You can test the OT in circuit. Both OT should measure alike.
Connect an ohm meter across the secondary. Should be an ohm or so, but not zero.
To test primary, connect ohm meter from CT to either end. Should be open.
Then test all three ends of the primary winding to ground with ohm meter. Should be open.
Have you tested the tubes? Much more likely to be a tube or capacitor problem than the OT.
Connect an ohm meter across the secondary. Should be an ohm or so, but not zero.
To test primary, connect ohm meter from CT to either end. Should be open.
Then test all three ends of the primary winding to ground with ohm meter. Should be open.
Have you tested the tubes? Much more likely to be a tube or capacitor problem than the OT.
Test the OT yourself.
Compare the two.
The 000 measurement means nothing unless done properly with accurate equipment.
Are you certain the technician is knowledgeable?
Compare the two.
The 000 measurement means nothing unless done properly with accurate equipment.
Are you certain the technician is knowledgeable?
The sad reality is it's probably not worth the cost to replace the OPT, if it is indeed dead. These amps were built with the cheapest parts available. Given it's age, who knows what will fail next. I'd say you've done well to get 15 years out of it with no problems.
jeff
To test a transformer or for that matter any component with an ohm meter you need to disconnect it from the circuit, are you disconnecting it from the circuit ?