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Post subject: Proper Lead Dressing for HRD what does this even mean?
Posted: Wed Sep 05, 2012 1:16 pm
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I'm currently looking into swapping out the drive volume knob on my 96' 4x10 HRD from the B100K to a A250K. Looks like a fairly easy mod, which brings me to my question. Since I need to (gently) mash the PCB down on to the wires and 'fold' the ribbons attached to the tube PBC what is the best way to restore the 'lead dressing' for the wires once I'm done with the job? If anybody has a clear photo, illustration, cave drawing , etc, of how to best to achieve this arrangement of wires so I don't end up with a heap of 'hum, oscillation and/or hiss' after putting everything back together I would appreciate it.

Thanks!


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Post subject: Re: Proper Lead Dressing for HRD what does this even mean?
Posted: Wed Sep 05, 2012 2:48 pm
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This question was answered in this posting:

viewtopic.php?f=13&t=74318

There are handy pictures at the bottom showing how to clean up the wires.


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Post subject: Re: Proper Lead Dressing for HRD what does this even mean?
Posted: Wed Sep 05, 2012 4:19 pm
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Ummm, according to the schematic

http://support.fender.com/schematics/gu ... ematic.pdf

the Drive volume control (R7) IS a 250k ohm, audio taper pot.

The Master volume control (R26) is a 100k ohm, linear taper pot and that is the correct type of pot for that function. Switching it to an audio taper serves no purpose.

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Post subject: Re: Proper Lead Dressing for HRD what does this even mean?
Posted: Wed Sep 05, 2012 5:25 pm
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bluesky636 - I mis-typed, I should have said Hot Rod DeVille and I meant the 'Master' control, This pot (at least in my amp) was a B100K. The A250k is more gradual volume-wise. Thanks for the extra set of eyes.


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Post subject: Re: Proper Lead Dressing for HRD what does this even mean?
Posted: Wed Sep 05, 2012 6:45 pm
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Makes no difference. Except for the power supplies and speaker configuration, the schematics for the Hot Rod Deluxe and Hot Rod Deville are identical. A 100K linear pot is the correct type of pot for use as a master volume. The master volume is used to set the overall volume level of the amp and the drive volume is then used to control the gain and level of preamp distortion.

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Post subject: Re: Proper Lead Dressing for HRD what does this even mean?
Posted: Wed Sep 05, 2012 7:34 pm
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Zenarcade83 wrote:
This question was answered in this posting:

viewtopic.php?f=13&t=74318

There are handy pictures at the bottom showing how to clean up the wires.


Did you find the answer to your own question in that thread?

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Post subject: Re: Proper Lead Dressing for HRD what does this even mean?
Posted: Wed Sep 05, 2012 8:56 pm
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Bill-

I was looking for a more gradual volume increase (audio taper) at low volume levels vs the violent jump in volume associated with the linear pot. I bought the amp used in 2002 and its gotten worse over time. It adds a bit more control at lower volume and it sounds great! You may have already seen this, here's a great write up on 'pots' http://www.geofex.com/article_folders/p ... tscret.htm

And---


shimmilou

Yes, I did find an answer to my initial question about the lead dressing. I was concerned that if I went moving thing about it would create some nasty unwanted hum. I followed your pictures and everything sounds great! Thanks again for posting the clear pictures.

This forum is great, Bill and shimmilou. Thanks for your insights, makes this a great place to get solid info. I appreciate it!


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Post subject: Re: Proper Lead Dressing for HRD what does this even mean?
Posted: Wed Sep 05, 2012 9:13 pm
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Zenarcade83 wrote:
Bill-

I was looking for a more gradual volume increase (audio taper) at low volume levels vs the violent jump in volume associated with the linear pot. I bought the amp used in 2002 and its gotten worse over time. It adds a bit more control at lower volume and it sounds great! You may have already seen this, here's a great write up on 'pots' http://www.geofex.com/article_folders/p ... tscret.htm



Yes, I am very familiar with that article (I have referred others to it several times in the past) and the different pot tapers. My point is, the function of a master volume control is different from that of the clean volume and drive volume controls. The master volume is used to set the maximum operating level of the power amp stage, which will usually be in about the middle of the pot's curve. It should be used as a "set and forget" control. With an audio taper pot, that point will never be reached unto the pot is almost maxed out. The clean volume and drive volume are audio taper because that corresponds to how the ear/brain hears things. Those are the controls that you should be using to set the desired gain and loudness of the amp.

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Post subject: Re: Proper Lead Dressing for HRD what does this even mean?
Posted: Wed Sep 05, 2012 9:55 pm
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Did Fender switch the Master Vol pot in 2003 (or so) from the B100k to A250k? I ask because this seems to be a common 'mod' on a lot of forums.


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Post subject: Re: Proper Lead Dressing for HRD what does this even mean?
Posted: Wed Sep 05, 2012 10:06 pm
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Zenarcade83 wrote:
Did Fender switch the Master Vol pot in 2003 (or so) from the B100k to A250k? I ask because this seems to be a common 'mod' on a lot of forums.


Nope. Still a 100K linear pot in the Series III Hot Rods.

Its a "common mod" because people don't understand the purpose and use a master volume control. :lol:

When I use the Drive channel on my Blues Deluxe Reissue, the Master is usually set between 3 and 8 and the Drive volume is used to control the gain and preamp distortion. A Master volume amp is designed to provide primarily preamp distortion so that you can set the overall volume to where you want it and use the Drive control for distortion.

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Post subject: Re: Proper Lead Dressing for HRD what does this even mean?
Posted: Thu Sep 06, 2012 6:35 am
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I appreciate your purist approach to the circuit; why mess with something that is already working and sounds good. Unfortunately I'm afflicted with the 'must modify' and ' inadvertently break things' syndrome. I think my next mod will be to bring some of the bass back into the drive channel, per the Justin Holt page :)

I do have a blown speaker, can you recommend a good replacement?

Rock!


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Post subject: Re: Proper Lead Dressing for HRD what does this even mean?
Posted: Thu Sep 06, 2012 1:34 pm
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Zenarcade83 wrote:
I appreciate your purist approach to the circuit; why mess with something that is already working and sounds good. Unfortunately I'm afflicted with the 'must modify' and ' inadvertently break things' syndrome. I think my next mod will be to bring some of the bass back into the drive channel, per the Justin Holt page :)

I do have a blown speaker, can you recommend a good replacement?

Rock!


I am familiar with the Justin Holt site.

Pick up a copy of this:

http://www.amazon.com/How-Hot-Rod-Your- ... ender+amps

It has several good mods for the Hot Rod Deluxe/Deville.

Weber speakers makes several 10" speakers that would be a good match:

http://www.tedweber.com/

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Post subject: Re: Proper Lead Dressing for HRD what does this even mean?
Posted: Fri Sep 07, 2012 10:19 am
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Bill-

Thanks for the excellent tips. I just added the 'How to Hot Rod...' to my amazon card, and I'll check out the Weber site. The prices seem reasonable for a good replacement speaker.

Thanks again-


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Post subject: Re: Proper Lead Dressing for HRD what does this even mean?
Posted: Fri Sep 07, 2012 11:16 am
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You're welcome. Have fun. :D

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