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Post subject: Re: NAD HotRodDeluxe III
Posted: Tue Jan 14, 2014 1:25 am
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T2Stratman wrote:
Modwiz...Not sure how I missed this NAD of yours, but Wow, that HRD is a looker that is for sure. Congrats. I can't add anything that hasn't already been put forth, but sounds like you are digging the amp and tweeking the tubage in the right way. Enjoy!

T2


I am really liking it. It is all about the clean channel for me. The drive channel loses so much bottom end it is like plugging into a different amp. Drive to more drive has a tonal relationship but, clean and drive live in different tone realities.

I have it tubed up and sounding good.......for now. :D

V1=JJ5751, V2=TS12ax7, V3=JAN-Philips 12at7WC. TS 5881 power tubes.

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Post subject: Re: NAD HotRodDeluxe III
Posted: Thu Jan 16, 2014 6:08 pm
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I was totally surprised by my second try at using the overdrive channel a few weeks back. In my first try I did not push in the more drive button, on the second try I did. It is actually usable. But disclaimer, I use a volume box in my efx loop. Turning the volume down has the effect in mitigating some of the harsh trebles.

http://www.ebay.com/itm/Original-Volume ... 2ec81dffcc

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Post subject: Re: NAD HotRodDeluxe III
Posted: Thu Jan 16, 2014 8:00 pm
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desertbluesman wrote:
I was totally surprised by my second try at using the overdrive channel a few weeks back. In my first try I did not push in the more drive button, on the second try I did. It is actually usable. But disclaimer, I use a volume box in my efx loop. Turning the volume down has the effect in mitigating some of the harsh trebles.

http://www.ebay.com/itm/Original-Volume ... 2ec81dffcc


I will keep looking for some use in the drive channel. I wonder if there is a way to make that channel's tone stack to allow more bass frequencies without losing the trebles.

Conceptually, it seems doable. It is the practical that matters though. :D

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Post subject: Re: NAD HotRodDeluxe III
Posted: Thu Jan 16, 2014 9:25 pm
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Half of V2 is used only for the drive channels. You might try a 5751 there also. :idea:

The tone stack is the same one used for normal and drive channels, so you can't change it just for the drive channels.

Some suggestions for some simple mods:
I added a jumper to the mid pot on mine (ala Billm), which gives more control of the overall tone stack, particularly the mids. This jumper might help get you what you want as far as more bass without losing treble. I also changed the value of the SGRs from 470 ohm to 2K ohm, which gives a slightly more compressed tone. Also, I added an extra 47 µF cap to the first stage in the power supply, which tightened up the low end a bit.

With the same preamp tube lineup as yours, and a few slight mods, I now have the perfect sounds for me, more mellow drive channels and still the sparkling warm clean channel.

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Post subject: Re: NAD HotRodDeluxe III
Posted: Thu Jan 16, 2014 9:39 pm
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desertbluesman wrote:
I was totally surprised by my second try at using the overdrive channel a few weeks back. In my first try I did not push in the more drive button, on the second try I did. It is actually usable. But disclaimer, I use a volume box in my efx loop. Turning the volume down has the effect in mitigating some of the harsh trebles.

http://www.ebay.com/itm/Original-Volume ... 2ec81dffcc


You do realize that you now have THREE volume controls in the circuit now, don't you?

1. Drive
2. Master volume
3. Volume box

The master volume is used to set the overall level of the Drive channel. Adding the volume box is a tone sucking waste of money.

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Post subject: Re: NAD HotRodDeluxe III
Posted: Thu Jan 16, 2014 9:48 pm
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modwiz wrote:
I will keep looking for some use in the drive channel. I wonder if there is a way to make that channel's tone stack to allow more bass frequencies without losing the trebles.

Conceptually, it seems doable. It is the practical that matters though. :D


You can change the s l o p e resistor (R12) from 130K to a smaller value. Experiment with values from 100K down to 56K. Marshall uses a 33K s l o p e resistor. Decreasing the resistor value will provide more upper bass/lower mids. Yes, this will affect both the clean and drive channels as shimmilou stated.

http://support.fender.com/schematics/gu ... _Rev-B.pdf

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Post subject: Re: NAD HotRodDeluxe III
Posted: Thu Jan 16, 2014 9:53 pm
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That reminds me that I also clipped R105.

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Post subject: Re: NAD HotRodDeluxe III
Posted: Thu Jan 16, 2014 10:06 pm
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shimmilou wrote:
That reminds me that I also clipped R105.


What the heck does that resistor do?

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Post subject: Re: NAD HotRodDeluxe III
Posted: Thu Jan 16, 2014 10:18 pm
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bluesky636 wrote:
modwiz wrote:
I will keep looking for some use in the drive channel. I wonder if there is a way to make that channel's tone stack to allow more bass frequencies without losing the trebles.

Conceptually, it seems doable. It is the practical that matters though. :D


You can change the s l o p e resistor (R12) from 130K to a smaller value. Experiment with values from 100K down to 56K. Marshall uses a 33K s l o p e resistor. Decreasing the resistor value will provide more upper bass/lower mids. Yes, this will affect both the clean and drive channels as shimmilou stated.

http://support.fender.com/schematics/gu ... _Rev-B.pdf


I guess sticking to the stock will serve me best....for now. :D The clean channel is as yummy as I can expect from a modern fender and it is pretty yummy. Plenty of bass available there. No need chasing after tone in a channel I will have little use for with my current guitar style. Which is writing nice chords and rhythms for bass parts. :lol:

As usual, thanks for the info and assistance.

Getting the

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Post subject: Re: NAD HotRodDeluxe III
Posted: Thu Jan 16, 2014 10:19 pm
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shimmilou wrote:
Half of V2 is used only for the drive channels. You might try a 5751 there also. :idea:

The tone stack is the same one used for normal and drive channels, so you can't change it just for the drive channels.

Some suggestions for some simple mods:
I added a jumper to the mid pot on mine (ala Billm), which gives more control of the overall tone stack, particularly the mids. This jumper might help get you what you want as far as more bass without losing treble. I also changed the value of the SGRs from 470 ohm to 2K ohm, which gives a slightly more compressed tone. Also, I added an extra 47 µF cap to the first stage in the power supply, which tightened up the low end a bit.

With the same preamp tube lineup as yours, and a few slight mods, I now have the perfect sounds for me, more mellow drive channels and still the sparkling warm clean channel.


Thanks, Shimmilou. I'll cyber travel to BillM's site and have a looksee.

I don't know what SGR means. :oops:

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I have some Fender gear.
(Telecaster, Jaguar, Villager 12 String. Mustang l, Bronco, SCX2, Rumble 350, HRDIII, Rumble 2x8 Neo Cab)
http://www.reverbnation.com/modwiz


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Post subject: Re: NAD HotRodDeluxe III
Posted: Thu Jan 16, 2014 10:22 pm
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modwiz wrote:
I don't know what SGR means. :oops:


Screen grid resistors. R61 and R62. Basically they control the electron flow between the cathode and plate.

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Post subject: Re: NAD HotRodDeluxe III
Posted: Thu Jan 16, 2014 11:25 pm
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bluesky636 wrote:
shimmilou wrote:
That reminds me that I also clipped R105.


What the heck does that resistor do?


It's in parallel with the bass and mid pots, and I see no reason for it, other than to screw with a traditional tone stack, which works just fine without it.

This is what engineers do! :P

:lol:

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Post subject: Re: NAD HotRodDeluxe III
Posted: Thu Jan 16, 2014 11:29 pm
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bluesky636 wrote:
modwiz wrote:
I don't know what SGR means. :oops:


Screen grid resistors. R61 and R62. Basically they control the electron flow between the cathode and plate.


Sorry about that modwiz. :oops:

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Post subject: Re: NAD HotRodDeluxe III
Posted: Fri Jan 17, 2014 4:04 am
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Thank you both.

Hmm, a resistor neutering,eh? I am learning that less 'clutter' in the signal path, allows for a 'better' sound. I am finding myself in agreement with that view.

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Post subject: Re: NAD HotRodDeluxe III
Posted: Fri Jan 17, 2014 3:22 pm
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modwiz wrote:
I guess sticking to the stock will serve me best....for now. :D The clean channel is as yummy as I can expect from a modern fender and it is pretty yummy. Plenty of bass available there. No need chasing after tone in a channel I will have little use for with my current guitar style. Which is writing nice chords and rhythms for bass parts.


I use both a Nady TD 1 and a Seymour Duncan Twin Tube tube distortion stomp with tone controls on both. Of those I like the $85 (I paid new) TD 1 over the $225 Duncan actually. The Nady has way more tone control. Both are very sweet bloozie sounding items.

http://www.music123.com/amplifiers-effe ... tion-pedal

I also have a back up TD 1 in my road case for the HRD as it is all I need to add to the HRD if playing out. At home I have a pedal board I stick in front of the HRD or any other amp I have, but it is complicated wiring to set up so for a grab and go I only use the TD 1 with the HRD on board verb.

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