'71 Fender Deluxe reverb Vibrato question

[Danglin' Fury]

Fixed the other problem now I'm down to the vibrato. I have no clue how this thing is supposed to work. According to the schematic, off the anode of side one of the V5 12AX7, I'm supposed to have +345V D.C. I measure +460. What's up with that? All the resistors seem to read ok. One seemed to jump around but I think I had my lead on some crusty flux I also changed the tube to no avail. Thanks for lookin'.


I am also supposed to have +270 on the side 2 anode. I have a measured +460 V.

[txstrat]

Have you measured the voltages with the tubes plugged IN ?

[52 Bill]

And I'll ask the obvious question:

Do you have a footswitch plugged into the amp?

[Danglin' Fury]

I do not have the footswitch and yes the tubes are plugged in. Apparently the strange schematic symbol, according to a local electronic's repair shop, is a neon bulb and a "light-dependent resistor". Bulb comes on, sound. Bulb goes off, no sound creating the vibrato effect. I am going to be the Ohm Ranger again but I swear the resistances were correct. Also gonna check if the neon bulb lights or not. If the resistors are correct, and the bulb lights, it's probably a cap. Any other suggestions/pointers would be greatly appreciated. Thanks for lookin'.

O.K. really dumb question: Do you need the footswitch for the vibrato to work? Also The voltages should at least be in the ballpark of what the schematic says even w/o the footswitch correct?

[Enzo]

If the bulb blinks, then the photocell is suspect, not a cap.

Yes, you MUST have a footswitch to turn the trem circuit on. Of use a clip wire to ground off the FS jack.

Without the footswitch, the negative bias supply voltage is applied to the tube grid, turning it off completely. As a result, your tube will not conduct, and all those voltages will read high. So, no, the voltages will not read correct without the footswitch.

[Danglin' Fury]

Hey Enzo, thanks for lookin at this post. I appreciate yours and everybody else's help. Thank you all. It's good to find a forum where pretty much all the people are cool and nobody is a smarta$$ d-bag. You've helped me out a few times and it is always greatly appreciated. So if the footswitch isn't in, the bulb wouldn't even blink? This thing is probably ok then. I'll try grounding it out and see what happens.