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FDP Forum / Amp Mods, Repairs, and Projects / Deville Low Volume Issue

bicoastal1

USA/NY

May 14th, 2012 07:47 PM   Edit   Profile   Print Topic   Search Topic

Got a 96 2x12 Fender Deville. The op tranny has some laminate rust. Volume is very low. I already
resoldered the power tube mounts. Tubes are new. The phase inverter circuit has 4 caps, two on the screens, two on the plates. Can I lift the hot side on those and see if they leak dc?

pdf64

UK

May 16th, 2012 10:35 AM   Edit   Profile   Print Topic   Search Topic

The usual cause of that is bad switch contacts on the fx loop sockets; try plugging a lead between send and return.
It would be unusual for leaky caps to cause very low volume, without other symptoms.
Have you checked voltages against the schematic?
See http://www.webphix.com/schematic%20heaven/www.schematicheaven.com/fenderamps/blues_deville.pdf

The voltages in ovals are signal voltage, for a given input signal / control setting. The Vdc at the various test points should be adequate for the moment though.

Also much of Justin Holton's HRD site would be applicable to your Deville.
http://www.justinholton.com/hotrod/

Pete.

Steve Dallman
Contributing Member
*****

Merrill, Wisconsin

Ain't turned 60, but I got my blinker on
May 16th, 2012 02:25 PM   Edit   Profile   Print Topic   Search Topic

One power tube going out is also a common problem. Sometimes due to a bad heater connection at the tube socket, a bad tube socket, or even a failed tube.

When it's warmed up, see if both power tubes are lit up. Check if one is cool/cold and one is hot. If one is hot and one is cold, swap the tubes. If the same tube stays cold, it's the tube. If the other goes cold, and the formerly cold one heats up, it's the socket or related resistors (screen or grid.)

pdf64

UK

May 16th, 2012 04:06 PM   Edit   Profile   Print Topic   Search Topic

Just noticed on TGP, a tech 'Ronsonic' advised a HRD owner with this fault -
'The usual fault in the HRDs for low, distorted volume is an open plate resistor on the phase inverter tube. Measure volts at the PI tube (the one closest to the power tubes) pins 1 and 6 should have similar high voltages. The one that doesn't has an open plate resistor. Ohm them, these are 82K and 100K. My luck it's usually the one that's hard to get to. While you're there look for resoldering that you should do.'

Which turned out to be the fault.
Pete.

acorkos

SoCal

Jun 8th, 2012 10:49 PM   Edit   Profile   Print Topic   Search Topic

make sure the speaker plug is in the INT SPEAKER jack and not the EXT SPEAKER jack

FDP Forum / Amp Mods, Repairs, and Projects / Deville Low Volume Issue




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