National Glenwood Amp - Tremolo Not Working

[Jecarroll7]

Any chance someone has a schematic for a National Glenwood model N6416T amp? or make a few suggestions to get the tremolo working? The rest of the amp works great.

I've looked at the Supro Model S6616 and Gretsch G6152 schematics. They're close but there are some differences.

Thanks in advance.

[TomCarlos]

How about we start with some basics......

Have you had this amp for a while and was the Tremolo working previously?

Did you try a different tube?

You didn't accidentally install a tube for testing and put the wrong tube in the socket? And what type of tube is used for the Tremolo?

The tube is sitting firmly in the socket?

The tube glows (meaning the heater is working, just like the other tubes)?

Other than the Tremolo, the amp is working ok?

If you pull the Tremolo tube out, is the amp working ok?

You checked to make sure you do not have loose or disconnected wires?

If ok on all the above, have you taken voltage measurements on the tube?

[Jazz P Bass]

I believe the Valco 518-80 may be close Tremelo wise.
No Reverb though.
For the Tremelo to work the capacitors to the left of the grid must make an oscillating circuit.
That and a good tube.

[Marshtech]

what's the condition of the tremolo foot switch jack? there's a shorting contact in that jack that may be bad.

[Jecarroll7]

Thank you all for your suggestions. After walking the Supro 6616 schematic most of the day, checking all the caps and resistors I can say the tremolo circuit is dead on. But I’m embarrassed to say that it was a hidden broken wire at the tremolo switch. Found it while checking the grounds. It’s working like a champ now. Appreciate the help and suggestions. Jim

[drewl]

Hey, it happens to all of us.
you went through the circuit and found the problem.

[TomCarlos]

And now you have a checklist of things to look for should it happen again or in a different amp!