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Thread: hot rod deluxe volume drop...

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    KatyPerryologist astrozombie's Avatar
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    Default hot rod deluxe volume drop...

    today, while rehearsing with the Fender amp for the first time, the volume dropped on me. this amp is usually very loud. when the volume dropped however, I could push the knob until 12 and hear it well, but certainly not as loud as it should be. I don't know whats going on. what does this sound like the problem is?

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    Modsterbator trevorus's Avatar
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    Default Re: hot rod deluxe volume drop...

    Could be a failed tube, internal component failure, etc... Hard to tell through the interwebs what's actually going on...
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    Human powerplant Vasshu the humanoid typhoon's Avatar
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    Default Re: hot rod deluxe volume drop...

    It is used
    Tubeamps always have issues!!!
    Always!
    Not gonna miss you know!
    Information is not knowledge.

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    Slam Dunk da Funk Funkfingers's Avatar
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    Default Re: hot rod deluxe volume drop...

    Could be something as simple as dirty/corroded contacts. Could be a sick valve (tube). Could be our old friend, dried solder joints.

    If the volume drop happens on all channels, it is the output stage. If it happens on one channel but not the other, you are losing gain in the pre-amp circuit. The other possibility is the early signs of transformer failure. < Gulp! >

    Simple remedial tasks. (NOTE: Amp MUST be switched off and capacitors fully drained.)
    1) Clean the jack sockets.
    2) One by one, remove each of the valves. Clean the pins and pin base sockets of dust, moisture and corrosion.
    3) Inspect the spade terminals on the loudspeaker for security of fit.

    Afterthought: Are you running anything in the Effect Loop? If so, what gear and how is it connected?
    Last edited by Funkfingers; 05-02-2010 at 05:47 AM.

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    Our Neighbor Totoro FuseG4's Avatar
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    Default Re: hot rod deluxe volume drop...

    I feel bad for you dude! Right when you get your amp it messes up. How whack is that?

    I had volume drop issues with my blackheart back when I first got it. turned out the treble control pot was loose and wasn't fully making contact with the PCB. Tightening the nut on the pot fixed it.
    ----
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    Alnico 6/8 gibson175's Avatar
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    Default Re: hot rod deluxe volume drop...

    With tubes its like this:
    If a light blows in your house, don't call the electrician. Change the light globe.
    That old, potentially corroded amp of yours....I reckon the first thing you should have done is retube and rebias the whole thing.
    Clean the sockets while you are there - and while you are rebiasing, have a good look at the circuit board for corrosion or discoloration. Also a close inspection of all the resistors to make sure there are no burnouts.
    But first things first - just put in a full set of new tubes and see what happens.

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    KatyPerryologist astrozombie's Avatar
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    Default Re: hot rod deluxe volume drop...

    What do I clean the electronics with? Can it be wd40? I had contact cleaner laying around but can't recall where I last saw it.

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    Jessie Sammler
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    Default Re: hot rod deluxe volume drop...

    Don't use WD40 for that. Buy contact cleaner if you can't find yours.

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    Slam Dunk da Funk Funkfingers's Avatar
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    Default Re: hot rod deluxe volume drop...

    Hellermann Fospro. Available in aerosol cannister or, it says here, "in bulk for application by spray gun or by immersion".

    http://www.hellermanntyton.co.uk/doc..._Fospro_PX.pdf

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    KatyPerryologist astrozombie's Avatar
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    Default Re: hot rod deluxe volume drop...

    I just biased the amp.

    guy from Tube Depot said I can go as high as -80 mV safely.

    lets see how that works out.

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    Kyuss_Rockologist Rich_T's Avatar
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    Default Re: hot rod deluxe volume drop...

    I can't see that re-biasing it will fix the volume issue. Most likely culprit is a bad valve.
    "I believe the truth is not told between 9 and 5." - Hunter S. Thompson

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    KatyPerryologist astrozombie's Avatar
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    Default Re: hot rod deluxe volume drop...

    Quote Originally Posted by Rich_T View Post
    I can't see that re-biasing it will fix the volume issue. Most likely culprit is a bad valve.
    I took out the tubes, both power and pre.

    I swapped the order of the 6L6s as well as the 12AX7s, except for the new tungsol, which I left in v1.

    I then biased the amp.

    I tested it for about the last half hour. It's been working fine (knock on wood).

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    Moe's Bluesman Curly's Avatar
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    Default Re: hot rod deluxe volume drop...

    Quote Originally Posted by Rich_T View Post
    I can't see that re-biasing it will fix the volume issue. Most likely culprit is a bad valve.
    that's correct
    Quote Originally Posted by astrozombie View Post
    I took out the tubes, both power and pre.

    I swapped the order of the 6L6s as well as the 12AX7s, except for the new tungsol, which I left in v1.

    I then biased the amp.

    I tested it for about the last half hour. It's been working fine (knock on wood).
    then it's likely the problem may have been a poorly seated tube, rather than the re-biasing itself ... volume drops are not usually associated with bias problems
    "music heals"
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    Slam Dunk da Funk Funkfingers's Avatar
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    Default Re: hot rod deluxe volume drop...

    When this amplifier was first brought to our collective attention, the background story included a comment about the vendor having had "difficulty" selling.

    Interpretation #1 - Every potential purchaser up until AZ had found something about the amp unacceptable and, hence, declined to close a deal.
    Interpretation #2 - The vendor no longer made regular use of the amp. Hence, it had been "put out to grass" in the attic or an outbuilding.

    Hopefully, the only "unacceptable" thing about the Fender HRD is that it is NOT the fashionable amplifier of choice in PR just now. Low level neglect and/or inappropriate storage would be sufficient to explain most of the issues that AZ has encountered.
    Last edited by Funkfingers; 05-02-2010 at 01:09 PM.

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    Ultimate Tone Slacker Lake Placid Blues's Avatar
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    Default Re: hot rod deluxe volume drop...

    I was gong to suggest doing something but thought better of it. If it starts doing it again you should probably find a good tech to get this ironed out.

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    Our Neighbor Totoro FuseG4's Avatar
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    Default Re: hot rod deluxe volume drop...

    Glad your amp is working! Crank that normal channel!
    ----
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    KatyPerryologist astrozombie's Avatar
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    Default Re: hot rod deluxe volume drop...

    I think my amplifier is using an incorrect fuse.

    ill get back to you.

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    KatyPerryologist astrozombie's Avatar
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    Default Re: hot rod deluxe volume drop...

    I was right! this amp was running on the wrong fuse!

    the amp is 120v and calls for a 3A 250v fuse, and the previous owner had installed a 2A 250v fuse! could this be the culprit?

  19. #19
    Jessie Sammler
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    Default Re: hot rod deluxe volume drop...

    Quote Originally Posted by astrozombie View Post
    I was right! this amp was running on the wrong fuse!

    the amp is 120v and calls for a 3A 250v fuse, and the previous owner had installed a 2A 250v fuse! could this be the culprit?
    I doubt it; a low-value fuse usually just blows before it should, killing either part of the amp or the whole thing when you turn it on or push it hard. Still, it's a good idea to replace anything questionable with a fresh fuse of the right value. Note that you can use a fuse with a higher voltage rating than what you need, but you can't use one of a lower voltage rating. You need to get the current rating just right, though -- amps (A) or milliamps (mA) -- and whether it's fast-acting or slow-blow.

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    KatyPerryologist astrozombie's Avatar
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    Default Re: hot rod deluxe volume drop...

    Quote Originally Posted by Jessie Sammler View Post
    I doubt it; a low-value fuse usually just blows before it should, killing either part of the amp or the whole thing when you turn it on or push it hard. Still, it's a good idea to replace anything questionable with a fresh fuse of the right value. Note that you can use a fuse with a higher voltage rating than what you need, but you can't use one of a lower voltage rating. You need to get the current rating just right, though -- amps (A) or milliamps (mA) -- and whether it's fast-acting or slow-blow.
    so according to what you just said: the fuse had the wrong amount of amps.

    switched from 2A to 3.

    Just sprayed contact cleaner into every pot and jack, and cleaned. now I'll wait a while until I feel everything has dried before testing.

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