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Post subject: Hot Rod Deluxe - new tubes, NO SOUND
Posted: Sat Jun 28, 2014 4:48 pm
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I moved my HRD amp from 1 location to another with no apparent bumps.
I turned it on, no power light or sound but there was a quiet hum, meaning power was getting to it and the channel lights worked. I did briefly see the red power light on for second.
I replaced all 5 tubes and fuse, with the same result.
Is there anything I can do at home, with very limited tools, or do I need to take it to a tech?


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Post subject: Re: Hot Rod Deluxe - new tubes, NO SOUND
Posted: Sat Jun 28, 2014 6:07 pm
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If the light comes on then goes off immediately then it's probably blown the main power fuse (not the HT fuse). Check you definitely bought the correct rated fuse! And make sure you have the correct rated fuse for your local mains supply voltage, 120 Volt amps usually have fuses rated for twice the current of 240 Volt amps. Also check if the amp needs a slow-blow fuse, putting a fast blow fuse in a device that draws a heavy surge of current at switch on will result in constantly blown fuses in just the way you describe.

I tend to replace fuses ONCE and test carefully to see if the amp works. If it blows the fuse again then there's a fault in the amp. Could be a tube inserted wrong, check you've not forced the tubes into the sockets the wrong way round, check they're all seated correctly, double check you're definitely using the correct tube types(!), if everything checks out then you may want to refer the issue to second level support i.e. an amp repair professional.

My bet would be you need a slow-blow fuse. Check the manual!

Disregard this post - see later post!

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Last edited by GilgaFrank on Sat Jun 28, 2014 6:19 pm, edited 1 time in total.

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Post subject: Re: Hot Rod Deluxe - new tubes, NO SOUND
Posted: Sat Jun 28, 2014 6:12 pm
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see later post

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Last edited by GilgaFrank on Sat Jun 28, 2014 6:21 pm, edited 1 time in total.

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Post subject: Re: Hot Rod Deluxe - new tubes, NO SOUND
Posted: Sat Jun 28, 2014 6:14 pm
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Agree it can't hurt to check any fuses before bringing it in for service since that is an easy fix.

As far as anything else you can do yourself...Not really because you can not see electricity without a meter and even if you have a meter or scope and don't know what you are looking for it would prove futile and could give you a nice shock.

What you can do is with it unplugged disassemble stuff until you can see the entire guts and board. See if any components look burned, if any connections look undone, if any solder joints are bad or burned etc. If everything looks good you may need to bring it into a pro.

Typically if is was a tube it would not be all 5 go bad at once and you would most likely have noticed an intermittent or gradual problem that gets worse over time.

Since you hear something but the power light is not on it could be anything from the supply to something is loose. If it is a bad supply you would need to know the voltage specs even if you had a meter just to confirm.

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Post subject: Re: Hot Rod Deluxe - new tubes, NO SOUND
Posted: Sat Jun 28, 2014 6:19 pm
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Wait. Stop. Disregard my previous posts. I read your post again and the humming means power is getting to the transformer so it's not the mains fuse. If the channel lights come on then the mains fuse is fine and you need to check the HT fuse, my bad.

Same checks apply, make sure it's the correct rating and check if you need a slow-blow.

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Post subject: Re: Hot Rod Deluxe - new tubes, NO SOUND
Posted: Sun Jun 29, 2014 11:07 am
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I have the correct fuse as it was bought at reputable music store with the correct tubes. As well, I brought in the fuse I thought was the problem, the clerk checked, and gave me a new right one.
It doesn't look like anything is burnt or out of sorts.
The tubes were not glowing, although power in on.


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Post subject: Re: Hot Rod Deluxe - new tubes, NO SOUND
Posted: Sun Jun 29, 2014 11:17 am
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Do you own a meter that can check for continuity, resistance, capacitance, current? If not, take it to a qualified tech for repair. You need this tool to be able to at least check fuses, resistors, etc.

Mccquagly wrote:
I have the correct fuse as it was bought at reputable music store with the correct tubes. As well, I brought in the fuse I thought was the problem, the clerk checked, and gave me a new right one.
It doesn't look like anything is burnt or out of sorts.
The tubes were not glowing, although power in on.


After replacing tubes and fuses, does the power lamp light up? Have you tried a different guitar cable? Start with the simple stuff, guitar cable, input jacks, etc.

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Post subject: Re: Hot Rod Deluxe - new tubes, NO SOUND
Posted: Sun Jun 29, 2014 1:04 pm
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Mccquagly wrote:
I have the correct fuse as it was bought at reputable music store with the correct tubes. As well, I brought in the fuse I thought was the problem, the clerk checked, and gave me a new right one.
It doesn't look like anything is burnt or out of sorts.
The tubes were not glowing, although power in on.


Don't take the clerk's word for it, there's a strong chance he's sold you a lower-rated HT fuse instead of the mains fuse.

I'll tell you again - check what rating the fuse should be and whether you need a slow-blow type.

If the tube heaters aren't lighting up then the mains fuse has blown. If it's a glass fuse then have a really close look and see if the wire inside has snapped, that means the fuse has taken too much current and blown. If you have a multimeter then check for continuity across the fuse. If you don't have a multimeter then buy one and learn to use it. Although this last point may require you to read a manual.

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Post subject: Re: Hot Rod Deluxe - new tubes, NO SOUND
Posted: Sun Jun 29, 2014 1:25 pm
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Schematic says it's a 3 Amp fuse for 120 Volt or 1.6 Amp for 240 Volt supplies. Doesn't mention slow blow so let's assume it's a normal fuse.

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Is the fuse you fitted rated 3 Amp (110V) or 1.6 Amp (240V) ?

If it's a lower rating then they've given you the wrong one. If it's rated something like 315mA (that's 0.315 Amps) then it's a HT fuse and will blow immediately if used as a mains fuse.

EDIT: schematic's a little confusing, can't quite see if it's saying F1.6A or F1(space) .6A

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Post subject: Re: Hot Rod Deluxe - new tubes, NO SOUND
Posted: Sun Jun 29, 2014 1:31 pm
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Mccquagly wrote:
The tubes were not glowing, although power in on.


Wait ... does the power light come on and stay on? Do the channel indicators light up?

This is VERY important. If the power light comes on then the mains fuse is fine because there's voltage to the transformer and the fault lies after the transformer.

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Post subject: Re: Hot Rod Deluxe - new tubes, NO SOUND
Posted: Sun Jun 29, 2014 1:34 pm
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socal323 wrote:
Have you tried a different guitar cable?


I don't think a faulty guitar cable is ever going to stop the tube heaters from coming on.

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Post subject: Re: Hot Rod Deluxe - new tubes, NO SOUND
Posted: Sun Jun 29, 2014 2:46 pm
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When you say: "I moved my HRD amp from 1 location to another with no apparent bumps...", does that mean you moved it by hand from one room to another, or did you transport it from one place to another? Even though you say it wasn't bumped, transporting it in say a car could subject it to some significant shocks without realizing it - potholes, speedbumps, driveway ramps etc.

And what is the state of the power supply at the new location? Could it have received a power spike when plugged back in at it's new location?

Either way, I suspect that your issue isn't a simple one but rather has to do with the Solid-State portion(s) of the Amp. This could well mean that it's terminal, or at least requires the input of a trained Tech to figure it out.

Unfortunately, this means Shop Time and if the Amp is older or has seen much use, you could find yourself on a very expensive slippery $@!&# where replacement is going to be smarter than trying to fix it. You could easily rack up $150 in just having the Amp diagnosed.

Paying out 30%-50% of the Amp's original retail isn't the best course. Buying a good used one, or getting something new might be a better way to go.

Good Luck !

cheers!

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Last edited by Lightnin MN on Mon Jun 30, 2014 12:35 am, edited 1 time in total.

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Post subject: Re: Hot Rod Deluxe - new tubes, NO SOUND
Posted: Sun Jun 29, 2014 3:20 pm
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Lightnin MN wrote:
slippery $@!&#


I do enjoy a good slippery $@!&# once in a while.

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Post subject: Re: Hot Rod Deluxe - new tubes, NO SOUND
Posted: Sun Jun 29, 2014 6:17 pm
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thanks to all that have replied!!!

I moved the amp myself, when the piece of s&*t handle broke, but I did catch it before it hit anything.
I opened the back to check and all looked ok. I did lower the bias only slightly as I had it running rather hot as per ear candy youtube.
https://www.youtube.com/watch?v=sD_s5fCmalA
When I turned on amp, red power light came on for a millisecond, then off.
I looked at the fuse and the wire inside was connected.

I went to store and bought another fuse (same as I had, and correct as per manual), and 5 tubes to replace.
When all was replaced, nothing changed. I can hear power humming/buzzing, but tubes not lit. Channel switching ok and channel lights work accordingly. No sound from speakers.
I probably need some pro help...... UGH!


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Post subject: Re: Hot Rod Deluxe - new tubes, NO SOUND
Posted: Mon Jun 30, 2014 12:42 am
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GilgaFrank wrote:
Lightnin MN wrote:
slippery $@!&#


I do enjoy a good slippery $@!&# once in a while.


What is the state of our Society when software is geared so politically-correctly as to automatically censor (without regard to context) the perfectly acceptable word S...L...O...P...E because of it's possible misuse as a racial slur ??? :shock:

Yet another example of Liberalism stifling Free Speech !! :roll:

BTW, what ever happened to the old addage that: Sticks and Stones...Words will never hurt me ??? :wink:

cheers!

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