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Messages - Jazz P Bass

#316
Amplifier Discussion / Re: TDA7240 chip
February 03, 2018, 12:41:27 AM
The ic does seem hard to find.

Try this: https://www.questcomp.com/SearchResults.aspx
#317
Traynor TBM25
#318
Have you verified that the opamp supplies are stable & that they have zero volts ac ripple?

If the volume control affects the hum then the problem lies Before the control.
#319
The Newcomer's Forum / Re: Crate flexwave 15r problem
January 22, 2018, 11:25:22 AM
Not too sure why the TDA output IC went up in smoke.

The External Speaker jack has an internal tab to remove the Internal Speaker from the circuit when a plug is inserted.
#320
TBM25 schematic
#321
Your best bet is to contact Peavey.

1 (877) 732-8391

Peavey Electronics, Customer Service

#322
Please  check the fuse.
1 amp is what is the expected fuse.

#323
The Newcomer's Forum / Re: Crate flexwave 15r problem
January 20, 2018, 07:29:48 PM
Here is the schematic:
The speaker/ headphone circuit is very convoluted as the Headphone inserted must mute the speaker.
That said, the speaker will only work properly if the HP jack connections inside the jack are proper.

Proper testing with an ohmmeter will prove the jacks.
#324
Right On, Enzo.

#326
I was totally confused by that reply myself.

" Not seeing anything too familiar in any of those Schematics,, Thanks for posting any way,, It's going to be another fly by the seat of my pants repair,,, "

Oh, well.
#327
http://traynoramps.com/downloads/servman/sm_trayint.pdf

The full part number of the output transistor is '2SC2233'.
No need for the 'Y'.
#328
Schematics and Layouts / Re: National GA920P Schematic
December 16, 2017, 05:12:13 PM
Wow!

Those two schematics are totally different.

As the OP is searching for a schematic that uses 2SD428 (TO3 mount) the schematics may or may not be of help.

Maybe the Gibson G30 is closer.
#329
Schematics and Layouts / Re: National GA920P Schematic
December 16, 2017, 02:31:02 PM
It may help if you describe where the resistors go.

What points do they attach to?
Resistors burn up when another part of the circuit demands eccess current.
#330
Amplifier Discussion / Re: Capacitor conducting DC?
December 14, 2017, 10:56:20 AM
The only 100uf cap on the drawing is for the battery.

What problem are you troubleshooting?