Fender Hot Rod DeVille 410 cutting in and out

[g1]

Going back awhile you were able to eliminate the problem by plugging into the power amp in jack. Is this still the case?

[HeXeD]

Going back awhile you were able to eliminate the problem by plugging into the power amp in jack. Is this still the case?

Yes.. if I plug the guitar into the power amp in.. I get good volume. Unfortunately I do not get any of the nice clean sound/EQ when plugged into that of course.

[g1]

Carefully re-reading the entire thread, the preamp tube sockets were never re-soldered. Poor solder connections on the tube sockets are a fairly common cause of this type of complaint for these amps in particular.
Resolder ALL the tube sockets, no ifs, ands, or buts, even if it was actually done a few years ago!

[Jazz P Bass]

As many of these amps I have seen with totally crappy soldering, I would reflow the whole thing.

[acorkos]

I have seen cracked preamp tube pins, and cracked bayonet connectors (those amps have several) making intermittent contact, killing the signal. as suggested above, resolder all the preamp tube pins, and with the amp running, push on each bayonet connector

[Jazz P Bass]

I've run into (& missed) cracked socket pins also.

Embarrassing when they come back.

[52 Bill]

And some (not all) of the early amps had a run of bad 9 pin tube sockets where the contacts loosened up and wouldn't make contact with the tube pins. The bad ones are always molded black plastic.

You can service them by crimping the contacts tighter, but they will loosen up again with vibration.

[jerry creech]

410 fender amp problems

And some (not all) of the early amps had a run of bad 9 pin tube sockets where the contacts loosened up and wouldn't make contact with the tube pins. The bad ones are always molded black plastic.

You can service them by crimping the contacts tighter, but they will loosen up again with vibration.

ok i have this same problem did you ever find what was wrong with your amp i too can bang the top of mine at it also will come back on thanks jerry

[Leo_Gnardo]

ok i have this same problem did you ever find what was wrong with your amp i too can bang the top of mine at it also will come back on thanks jerry

It's an old thread but these amps are still around & still showing up with this type of problem. Before getting into it any further it's worth trying a simple tube re seating routine, just pull each one out then stick it back in. Pins get corroded sometimes this is enough to break thru the shmutz and get going again. If not, here's some common trouble spots to look for, not a complete list by far:

a. Input jack coming loose from PC board. Also defective input jack, just had one of these.

b. Bad solder connections, especially at tube sockets - those are easy to see & re solder.

c. Power amp in socket getting corroded with age. Gotta pull the whole board out to replace, what a pia.

d. Low voltage dropping resistors coming loose from board, solder cracking there. Near the bottom center of the main PC board you'll see a pair of (usually) 470 ohm white cement-block resistors. They get ripping hot in use and loosen from the board. Same pull the board out & resolder task.

e. External speaker jack. I know, nobody hardly ever uses these, no matter. There's a built in switch to decide whether your speaker is connected to 4 or 8 ohm output windings, these switch contacts corrode over time and connection to your internal speaker becomes intermittent. Clean switch contacts or replace jack.

f. Speaker cable plug. They make a nice amp then put on this 19-cent made-in-hong-kong piece of junk to connect the speaker, phooey. Sometimes re seating it is enough, sometimes you have to replace the plug, in that case splash out for a genuine Switchcraft plug & never worry again. At the other end of this wire, the spade connectors at the speaker terminals sometimes loosen or corrode. Re seat them & if that doesn't work, cut 'em off and solder the wires on.

g. Bad solder connection, could be anywhere on the pc board. First suspicious areas are all the ribbon cable connections. Then everything else.

Hope this helps.

[jerry creech]

thanks i will start trying some of the list of things you gave me to start a break down on what the problems are and thanks again for your time