I was setting up to playing a gig with my 1981 2 hole Hiwatt Dr-504 and after a little warm up and flick of the standby no sound was coming out of cab.
Everything was plugged in and set properly I knew that for sho.
My quess is the master volume pot went out?
Any quess as to what happen- before it went out I heard a little fizzle not sure what that was.
The long and skinny of it is that it remained power so I am guessing its not fuses.
'81 DR504 Powered but No Sound
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Dr.HI-TONE
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Re: '81 DR504 Powered but No Sound
it is most likely a tube that died.
I would guess the phase inverter first, but it could be any of them.
Not likely a pot.
I would guess the phase inverter first, but it could be any of them.
Not likely a pot.
Re: '81 DR504 Powered but No Sound
Nope changed all tube EL34's and all pre-amp tube still no luck or sound.
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OldSchoolDave
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Re: '81 DR504 Powered but No Sound
Speaker fuse go bad? Need a meter to verify continuity.pjking81 wrote:Nope changed all tube EL34's and all pre-amp tube still no luck or sound.
Dave
Re: '81 DR504 Powered but No Sound
If you haven't already, check the HT fuse. If it is blown, the pilot light will come on, but no sound will come out.
http://hiwatt.org/tech.html
--mark
http://hiwatt.org/tech.html
--mark
Re: '81 DR504 Powered but No Sound
I changed the V1 (HT) fuse and no luck.
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OldSchoolDave
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Re: '81 DR504 Powered but No Sound
Hmmmm. Pull the impedance selector out and check for corroded contacts. I've had those short out due to oxidation.pjking81 wrote:I changed the V1 (HT) fuse and no luck.
Have you checked the Phase Inverter (middle of the 3 preamp tubes), as Dr.HI-TONE suggested?
Dave
Re: '81 DR504 Powered but No Sound
Turns out the fuse I was originally given to replace the one that burnt out was faulty.
I went back to the store and got another and like magic my Hiwatt lives again!
Well it wasn't just that, I went through two fuses after the first went I had a pair of Winged 'C" in there, threw in the fuse and bang it works, and then I swapped the tubes for a pair of JJ's and the it blew the fuse. I got another fuse and a fresh pair of tubes (wait don't crinch) Mesa Boogie EL34's, threw in the second fuse and it works again and still has.
And to think I had it up for sale at a $1,000 (originally paid $1,350 plus shipping) and a tech wanted to buy it and so he looked it over and told me that I just need a fuse.
He knew that if it was repaired that my asking price would go up, so he saved me from selling.
Phew that was close!
I went back to the store and got another and like magic my Hiwatt lives again!
Well it wasn't just that, I went through two fuses after the first went I had a pair of Winged 'C" in there, threw in the fuse and bang it works, and then I swapped the tubes for a pair of JJ's and the it blew the fuse. I got another fuse and a fresh pair of tubes (wait don't crinch) Mesa Boogie EL34's, threw in the second fuse and it works again and still has.
And to think I had it up for sale at a $1,000 (originally paid $1,350 plus shipping) and a tech wanted to buy it and so he looked it over and told me that I just need a fuse.
He knew that if it was repaired that my asking price would go up, so he saved me from selling.
Phew that was close!