Decided on a second push with the Monarch. I performed OC's test on the video stage mentioned in post #267 again just to make sure I was doing it correctly.
You can see M4 disconnected in the upper right hand corner of the picture and the clip lead on pin 2 of the 12AU7 towards the middle.
The test produced no results.
Quote:
Originally Posted by old_coot88
Doggone. Now this may sound like a dumb question, but are the heaters in the 12AU7 video amp tube (V6) lighting up? It has two heaters. For that matter, are there any other tubes in the chassis (other than the 1X2) that are not lighting up? In know, dumb question but it has happened to me more than once. Chased a problem around in circles and it was a cold heater all the time.   |
This is a picture of the 12AU7, lit up like a Christmas Tree. All other tubes in the set are also lit.
I've also checked the voltages on several of the tubes including all of the video section. What I've noticed is that with my input voltage at 117vac my B+ is running around 15% high across the set, but it is getting to the correct pins. I have not checked the voltages on the tuner tubes. Measuring them from the bottom of the set is impossible so I will need to acquire some extenders.
I'm going to bring some new tools to the party to help the second push along. I'll have a scope, and a video generator tomorrow. I'm not sure these will help in my current campaign, but they're there if needed.
I hope all of you who have been helping me along are up for a second push
.