No Vibrato 1977 Twin Reverb / UPDATE:

[plexi50]

I have no vibrato in this Twin Reverb

http://s356.photobucket.com/albums/oo5/plexijtm45/?action=view&current=TRVibrato.mp4

[sluckey]

Take a look...

http://www.el34world.com/Forum/index.php?topic=10162.0

[plexi50]

Excellent. I tested the roach as instructed in the thread. The analog shows no wobbling or movement. I had ordered one last week and it should be here by friday. Thanks Steve*

[plexi50]

I got the new roach today and put it in the amp. Vibrato is working now

When removing the old roach the LDR fell out of the plastic tube so it appears that the old roach was bad after 33 years

I

[mresistor]

Before you throw the old roach away, it could be that the adhesive glueing the neon lamp to the ldr just got old and failed. One could glue them back together and see if it still works. Webers site has some info on this. It sure appeared that your neon bulb was still working.

some roach info

[plexi50]

Thats an interesting link mresistor. Thanks for the info!

[duke of earl]

This is the amp that motivated me to build my first. I have one of these and got sick of playing it because it was incapable of producing good tone. Built my own 50 watt Hoffman version and wow was I amazed. Sorry about hijacking your thread.