It is currently Mon Mar 16, 2020 4:12 pm

All times are UTC - 7 hours



Post new topic Reply to topic  [ 4 posts ] 
Author Message
Post subject: Hot Rod Deluxe 3 issues...
Posted: Mon Nov 28, 2016 3:47 pm
Offline
Hobbyist
Hobbyist

Joined: Mon Nov 28, 2016 3:45 pm
Posts: 8
Hello everyone! I've got a HRDx 3 that out of the blue started on the clean channel sounding wooly, slightly distorted, like a blanket is over the amp, clarity gone and dull. First of all, I changed all (power and pre) the tubes..no change. Plugged in a different speaker to the output, sounds the same with any speaker. Plugged my speaker into another amp, my speaker sounds fine. Plugged into the power amp...no change in sound. Biased at 74mv, C31 =415v, C33=414v, C35=368 C36=315

D13, R78 & 79 slight heat discoloration
V4 is WAY hotter than V5

Before I start major surgery...which I don't know where to start any way, I was going to irresponsibly shotgun fix (replace a bunch of stuff and see if its fixed). I was thinking of getting the Fromel mod and HOPEFULLY that would fix it, but thats wishful thinking.

From everything I've read, It looks like I have similar issues except loss of power. It sounds like a dying tube/tubes but unless I used bad tubes when I changed them out twice, I'm not sure about what else to do. I also started thinking about gutting it and doing point to point...very frustrating.

From everything I've read, It looks like I have similar issues except loss of power. It sounds like a dying tube/tubes but unless I used bad tubes when I changed them out twice, I'm not sure about what else to do. Is there anything I can read from my multi meter that would help diagnose before doing anything else? Any and all help appreciated, It's been a month of research before posting and now i;m here...


Top
Profile
Fender Play Winter Sale 2020
Post subject: Re: Hot Rod Deluxe 3 issues...
Posted: Mon Dec 05, 2016 4:48 am
Offline
Rock Icon
Rock Icon
User avatar

Joined: Fri Feb 05, 2010 4:31 am
Posts: 14049
Location: Province de Québec, Canada
Check / read heater supply voltage.

You need good electronic skill to work and fix this amp


Top
Profile
Post subject: Re: Hot Rod Deluxe 3 issues...
Posted: Mon Dec 05, 2016 4:12 pm
Offline
Hobbyist
Hobbyist

Joined: Mon Nov 28, 2016 3:45 pm
Posts: 8
Figured out it was bad plate resistor, R62. Changed it and it was working like brand new....Now I forgot to plug in the I believe CP 13 and 14 the two blue wires coming from the transformer that plug into the end of the board near V5 (heater filament wires) and turned on the amp...now it's distorted and I can only hear it if I turned it up all the way to 12...did I fry something? Tell me it wasn't the transformer...


Top
Profile
Post subject: Re: Hot Rod Deluxe 3 issues...
Posted: Mon Dec 05, 2016 4:20 pm
Offline
Rock Icon
Rock Icon
User avatar

Joined: Fri Feb 05, 2010 4:31 am
Posts: 14049
Location: Province de Québec, Canada
I think of a broken or disconnect wire(s) when you fixed pilot light CP13,14

Power transformer ? Not IMO, easy to see, read voltage at it output.


Top
Profile
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 4 posts ] 

All times are UTC - 7 hours

Fender Play Winter Sale 2020

Who is online

Users browsing this forum: No registered users and 2 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum

Search for:
Jump to: