06-14-2024, 01:43 PM
Cap C15 goes inline between `90 v. B+ to A+/B-.
There is no cap bypassing the 135 volts...
All the wires going to the UV-877 lamp should be connected together, soldered and taped. That same connection is to C12///
The lamp was an early solution to careless battery replacement.
Meter looks good
Has the 60 ohm +- volume resistance cartridge been installed yet?
Moving forward confirm connections for the "A" battery first, be sure there is no cross connection to "A" except at the A+/B-. DO the same for "C" be aware that the jacks may be problematic.
In a previous post I suggest two options for the "A" voltage. Try the "A" with "B" disconnected (all three voltages). Battery rheostat should affect all tubes, volume just one tube.
Be SURE "B" is NOT connected to the "A" voltmeter, be shame to take that out...
If all is well ,connect "B's", insert loop and give it a go...
GL
Chas
There is no cap bypassing the 135 volts...
All the wires going to the UV-877 lamp should be connected together, soldered and taped. That same connection is to C12///
The lamp was an early solution to careless battery replacement.
Meter looks good
Has the 60 ohm +- volume resistance cartridge been installed yet?
Moving forward confirm connections for the "A" battery first, be sure there is no cross connection to "A" except at the A+/B-. DO the same for "C" be aware that the jacks may be problematic.
In a previous post I suggest two options for the "A" voltage. Try the "A" with "B" disconnected (all three voltages). Battery rheostat should affect all tubes, volume just one tube.
Be SURE "B" is NOT connected to the "A" voltmeter, be shame to take that out...
If all is well ,connect "B's", insert loop and give it a go...
GL
Chas
Pliny the younger
“nihil novum nihil varium nihil quod non semel spectasse sufficiat”
