Super clean work - nice!Alright... slow progress, but progress nonetheless.
Made the mistake of cutting the IEC hole on the wrong side, effectively making this a left handed amplifier
Got as far as can be seen with the wiring today. Will give it a rest and come back to it tomorrow... I know i'll make a mistake if I try and do it all in one sitting. Doing things backwards has added a degree of complication I could do without.
So... troubleshooting phase one.
Pulled out the multimeter and prodded around. Found a loss of continuity in the shielded preamp wire. Great... maybe. Pulled it out, prepped up a new length, tested OK for continuity, so in it went. Tested again after install - once again no continuity. Not going to try a third time - need to find better wire. Might even ditch the shielded wire altogether.
Also - a little concerned I got no sound (I mean some kind of noise floor) when I fired the amp up. Assuming the PT is fine seeing 6.3V and 5V reading OK. OT getting readings in the 160 - 300 ohm range on the primary side which, no continuity through to second. Not sure how to otherwise trace issues on the secondary side.
Alternatively, maybe my GZ34 is kaput? No backup GZ34 to check, is it OK if I use a 5Y3 just to see if I can get this amp to make some noise?
What’s the 15K resistor in series with the 100K plate resistor to V1 pin 6 for? I can’t see that on the schematic.
Remove rectifier- and power tubes and connect AC filament voltage to OT anode circuits. On Octal sockets you can use solid 6A...10A wire bent to U-shape. Or tack solder pieces of wires to bottom side. Other filament phase on first socket and opposite phase on other. On Octals these come between 2 - 3 first and 7 -3 on other socket if you have wired filament phases to same socket pins. Remember now it is mirror view on tube sideAny suggestions on how to test my output transformer for faults? While still in the amp? I've been googling but not finding any clear troubleshoots to follow.
Not a whisper of noise coming from my speaker. Just want to isolate the OT not being the problem.