to HRM or not

[tictac]

FWIW,

I had the same debate HRM vs Non-HRM so finally decided to put them both in the amp with a switch on the back to go from one mode to the other. Also each mode has it's own master on the front panel so I can set the volume levels independently.

I only use the HRM with a "bypassed" tone stack so the footswitch is setup to turn on the boost and OD at the same time when needed.

The only other significant mod I think all ODS inspired amp should have is a switch to go between a choke and 330 to 500R resistor aka the robben ford switch. I use an ON/OFF/ON switch so the middle off postion is standby.

TT

[greiswig]

FWIW,

I had the same debate HRM vs Non-HRM so finally decided to put them both in the amp with a switch on the back to go from one mode to the other. Also each mode has it's own master on the front panel so I can set the volume levels independently.

Perfect! Just what I was hoping for. Tictac, would you consider posting some clips that compare the two modes using the same pickups, cab, etc. so that those of us who haven't heard the difference could do so?

[rutledj]

Perfect! Just what I was hoping for. Tictac, would you consider posting some clips that compare the two modes using the same pickups, cab, etc. so that those of us who haven't heard the difference could do so?

I'd like to hear the diff between choke and resistor also.


Rut

[llemtt]

FWIW,

I had the same debate HRM vs Non-HRM so finally decided to put them both in the amp with a switch on the back to go from one mode to the other

Unfortunately those two different D-flavours require radically different tweaks

but with a big chassis maybe you can build two completely separate preamps or at least two separate OD sections.

Teo

[tonelab2]

Thanks dogears, I was way off the mark. LOL it's the first time I've noticed the 6 band type. Thanks for the link.

The resistors are standard Bluesmaster Dumble fair. Some are 6 band....

http://samengstrom.com/nxl/2020/6_band_ ... ge.en.html

9.09K, 511ohm, 4.7K tail, and 100K feedback. 25K presence pot and .1uf cap. .02uf caps and a 47pf snubber between the plates.

Also, the V2 tube looks to have the first triode grounded out by the shielded cable. My guess is no trimmer or the trimmer is now a pot on the front. 3 stages and not 4. Carlton likes it clean. The 68K grid is useless since the triode is not operational. All in my opinion.....

Could someone with better eyesight than mine please check these photos(LC photo posted earlier) and give their opinion on the resistor values. Seems there's a mixture of 4 and 5 band. I suspect the OD trimmer is buried under the goo.

[drz400]

For what it's worth, I totally agree with you. I used to see RF live a lot in the very early 90s, and his tone defintiely changed a few years after that. While it could be that his amp underwent the HRM transformation around that time, there was something else: RF dumped the reverb (PCM70, I believe, or some times a "Real Tube Reverb" rack unit) from his rack at that same time. That could certainly contribute to the harsher tone he's had since then.

Gil

Last times I saw him he used a Zen Drive and a LP
I wish he would just go straight, Zen Drive is very hard sounding.
He didnt use his Dumbles either but a super I think. It was however rebuilt by Alexander

[Pete]

I suspect the OD trimmer is buried under the goo.

I guess the trimmer could be replaced with fixed values

Also, the V2 tube looks to have the first triode grounded out by the shielded cable. My guess is no trimmer or the trimmer is now a pot on the front. 3 stages and not 4. Carlton likes it clean. The 68K grid is useless since the triode is not operational. All in my opinion.....

I don't see anything grounded out by shielded cable, what am I missing? thanks

[Runaway J]

Someone out there who has good connections to 'Palm Beach Guitars' ?
[Service@palmbeachguitars.com]
I'm shure they took more pics of LC's amp.

[dogears]

Pete, my suspicion is that the other end of the cable has the shield and center tied. One must ground unused triodes....

I suspect the OD trimmer is buried under the goo.

I guess the trimmer could be replaced with fixed values

Also, the V2 tube looks to have the first triode grounded out by the shielded cable. My guess is no trimmer or the trimmer is now a pot on the front. 3 stages and not 4. Carlton likes it clean. The 68K grid is useless since the triode is not operational. All in my opinion.....

I don't see anything grounded out by shielded cable, what am I missing? thanks

[chris_sanford]

Also, the V2 tube looks to have the first triode grounded out by the shielded cable. My guess is no trimmer or the trimmer is now a pot on the front. 3 stages and not 4. Carlton likes it clean. The 68K grid is useless since the triode is not operational. All in my opinion.....

I don't see anything grounded out by shielded cable, what am I missing? thanks

I think what Scott meant was that the shielded cable (connecting to the OD 'level' control) provides a ground *reference* for the grid of the unused tube section. Since it looks like the plate and cathode are still connected, one would need that connection to avoid damaging the tube.

HTH,

chris

[Funkalicousgroove]

I'm still betting on the 4 stage thing, I'm gonna try it on my bench amp and see.

[Pete]

I'm still betting on the 4 stage thing, I'm gonna try it on my bench amp and see.

Yes, I take it you mean V2A followed by tone stack (trimmers) & vol/drive followed by V2B? Sounds interesting, would like to hear of your results, I may try it. Also, I believe I saw no snubbers on V2.

[chris_sanford]

I'm still betting on the 4 stage thing, I'm gonna try it on my bench amp and see.

Yes, I take it you mean V2A followed by tone stack (trimmers) & vol/drive followed by V2B? Sounds interesting, would like to hear of your results, I may try it. Also, I believe I saw no snubbers on V2.

Well, with the four stage setup, the drive control becomes the master, and the master turns into post-stack drive control. Pot values may need to change a little bit.

Mr Funk, how does it sound?

chris

[Funkalicousgroove]

I'll let you know when I try it!

[ayan]

I'll let you know when I try it!

Well, dude, hurry! Some of us are waiting to hear from you before we start our next amp, you know?

Gil