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Post subject: Hot Rod Deville II Schematic Diagram
Posted: Thu Jan 09, 2020 11:21 am
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Hello, I'm looking for the Schematic Diagram and also the Service Diagram for the Hot Rod Deville II or in other words the reissue (the one with the C56). Always find in the internet the Schematic Diagram and Service Diagram for the 1996 Hot Rod Deville and not the Reissue. Anybody?

Thanks in advance


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Post subject: Re: Hot Rod Deville II Schematic Diagram
Posted: Thu Jan 09, 2020 11:59 am
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I have Hot rod Deluxe / Deville III schematic and PCB Board
With C56 on V1B pin 8 / cathod
Is that you are looking for ?

I can send you PDF with you mail address :)


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Post subject: Re: Hot Rod Deville II Schematic Diagram
Posted: Thu Jan 09, 2020 12:27 pm
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stratele52 wrote:
I have Hot rod Deluxe / Deville III schematic and PCB Board
With C56 on V1B pin 8 / cathod
Is that you are looking for ?

I can send you PDF with you mail address :)


Hello thanks for your fast reply.

Yes please you can send it to albertojgg@hotmail.com

Thanks a lot really


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Post subject: Re: Hot Rod Deville II Schematic Diagram
Posted: Thu Jan 09, 2020 1:29 pm
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algajgg wrote:
stratele52 wrote:
I have Hot rod Deluxe / Deville III schematic and PCB Board
With C56 on V1B pin 8 / cathod
Is that you are looking for ?

I can send you PDF with you mail address :)


Hello thanks for your fast reply.

Yes please you can send it to albertojgg@hotmail.com

Thanks a lot really



Send :)


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Post subject: Re: Hot Rod Deville II Schematic Diagram
Posted: Thu Jan 09, 2020 2:01 pm
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What is the issue with the amp ?


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Post subject: Re: Hot Rod Deville II Schematic Diagram
Posted: Tue Jan 21, 2020 5:51 pm
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stratele52 wrote:
algajgg wrote:
stratele52 wrote:
I have Hot rod Deluxe / Deville III schematic and PCB Board
With C56 on V1B pin 8 / cathod
Is that you are looking for ?

I can send you PDF with you mail address :)


Hello thanks for your fast reply.

Yes please you can send it to albertojgg@hotmail.com

Thanks a lot really



Send :)


Hello Stratele

I received the schematic and compare it against the HRD II. And even tough I'm no a tech I could find out two differences. First: In HRDII R26 (master volume pot) is 100K type B and in HRDIII R26 is a 100K type A Second: In HRDII R13 (treble pot) is a 250K typeA and in HRDIII R13 is 250K typeB.

Fender says version III has graduated volume and treble pot tapers.

Is there any other electronic difference between this versions? Does anybody have version IV schematic?

Thanks in advance


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Post subject: Re: Hot Rod Deville II Schematic Diagram
Posted: Wed Jan 22, 2020 3:04 am
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As I ask 13 days ago with no answer ; :(

What is the issue with your amp ?


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Post subject: Re: Hot Rod Deville II Schematic Diagram
Posted: Thu Jan 23, 2020 12:49 pm
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The newest drawing I have is from 2010, # 79604. It shows C37 and C43, 47uf/100V have increased voltage rating. They kicked up to 160 volts.
While there is nowhere near 160 volts present, these caps are especially hardworking little guys. They run the Charge pump circuit to provide enough voltage for the bias circuit. One side of C37 is fed 39 VAC, As the voltage rises, it attracts an opposite charge on the other side. Then, as the 39 VAC drops back to zero, the accumulated charge on the other side dumps a high voltage spike through the steering diodes, hence the name, " charge pump". The spikes are absorbed by C43, filtered, and fed the higher DC voltage to the rest of the bias circuit.
While a normal filtered supply will absorb the peak AC voltage, it stays mostly charged throughout its service life. The current demands are dependent on volume, but it spends most of its life at B+.
The charge pump capacitor, by contrast, is fully charged and discharged 60 times a second. This mechanically stresses the cap. Electrically, the spikes of current attack the dielectric. That is probably why Fender increased the voltage rating.
It is clearly a reliability issue. I would recommend servicers take the cue from Fender and replace them as a matter of maintenance on every Hot Rod coming in the shop. They are too cheap to ignore the consequences of bias failure. That is, power tube meltdown. This is an issue that has plagued Marshall TSL and DSL amps. They used wimpy 22uf/ 50 volt caps. The bias drifted on warmup and the tubes would overheat and burn down the board.
While I haven't had a problem with the Fender caps, its only a matter of time before the caps wear out. I have seen other amps brought down by charge pump failure, most notably, a modern McIntosh. Its a trick little circuit that a designer can use to squeeze a little more voltage, but its a reliability nightmare and irresponsible to use unless planned obsolescence is your goal.
Early HRDX used a normal diode/filter supply and only the DeVilles used the charge pump. I have a HRDX with the charge pump from 2002., so I guess they all use it now. It probably is capable of biasing hotter tubes than the earlier supply. As long as you use the 160 volt caps now.


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Post subject: Re: Hot Rod Deville II Schematic Diagram
Posted: Sun Jan 26, 2020 11:11 am
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stratele52 wrote:
As I ask 13 days ago with no answer ; :(

What is the issue with your amp ?



Hello Stratele

Sorry for the delay in the replay really. My amp is oscillating making a high pitch and when turning the treble knob makes a noise, when using at band practice levels it blows the fuse. I took it to a tech in another city. I made the power tube test, turning on my amp without the power tubes and the fuse was safe. The only mods the amp has right now:

- TBV mod from tim
- Pulled out R105
- R5 changed from 1.5 to 1.8
- R12 $@!&# resistor from 130K to 120K

All the rest is stock


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Post subject: Re: Hot Rod Deville II Schematic Diagram
Posted: Sun Jan 26, 2020 2:15 pm
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Look some wire dress issue ? Or preamp tube.

I understand, tech did not find the issue yet.


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Post subject: Re: Hot Rod Deville II Schematic Diagram
Posted: Sun Jan 26, 2020 10:04 pm
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Stratle52 is right. I would look at wire dress. Form the ribbon cables to be flat against the rear cover when it is installed. I take it that it didn't do it before with the TBV mod installed.
Oscillations also come from too much gain. You might adjust the TBV resistor values upwards to regain stability.


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Post subject: Re: Hot Rod Deville II Schematic Diagram
Posted: Mon Jan 27, 2020 2:56 pm
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TimsAudio wrote:
Stratle52 is right. I would look at wire dress. Form the ribbon cables to be flat against the rear cover when it is installed. I take it that it didn't do it before with the TBV mod installed.
Oscillations also come from too much gain. You might adjust the TBV resistor values upwards to regain stability.


Hello Tim

Thank you one more time. Yes the amp doesn't oscillate before TBV. Please could you elaborate when say adjust resistor values upwards? sorry sometimes is hard for me to understand some phrases.

Thanks in advance.


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Post subject: Re: Hot Rod Deville II Schematic Diagram
Posted: Mon Jan 27, 2020 4:06 pm
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algajgg wrote:
TimsAudio wrote:
Stratle52 is right. I would look at wire dress. Form the ribbon cables to be flat against the rear cover when it is installed. I take it that it didn't do it before with the TBV mod installed.
Oscillations also come from too much gain. You might adjust the TBV resistor values upwards to regain stability.


Hello Tim

Thank you one more time. Yes the amp doesn't oscillate before TBV. Please could you elaborate when say adjust resistor values upwards? sorry sometimes is hard for me to understand some phrases.

Thanks in advance.


First things do do ;

1- post picture from inside your amp.
2- Follow Tim advice; : Form the ribbon cables to be flat against the rear cover when it is installed"

Look here how ribbon cables should be:

https://www.youtube.com/watch?v=Z_16JSYzA8Y


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