Hot Rodding a DSL40C???

syscokid said:
I really believe the 5751 is a mistake to use in this amp as the PI tube. The phase inverter tube is part of the power amp, and not the preamp. You might be slightly neutering the amp.
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I said this earlier in the thread and still believe it. IMO a 5751 has zero business being in the PI hole.
 
syscokid said:
In Robert's case, this is worth a try.


I really believe the 5751 is a mistake to use in this amp as the PI tube. The phase inverter tube is part of the power amp, and not the preamp. You might be slightly neutering the amp.
Click to expand...

I was thinking that, but that tube in that position was recommended by several amp techs and even Eurotubes as well.

This was an interesting read by Myles Rose...(5751 is recommended in V4 here too!)

http://www.guitaramplifierblueprinting.com/files/Phaseinverter.pdf
 
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gball said:
I said this earlier in the thread and still believe it. IMO a 5751 has zero business being in the PI hole.
Click to expand...

No argument there, but it's stunning how often they are used in the V4 (PI) position in the DSL's...

What would you prefer in V4???
7025WA???
ECC83MG
ECC83S

This is from Eurotubes website:

"V4 is the Phase Inverter position and we always use current balanced tubes in this position. The tubes listed are what we have found to work best.

ECC803
ECC81
ECC83
ECC83S
ECC83MG
5751"

Keep in mind that I have been reluctant to spend any more on this amp just yet, so I have limited my experiments to what tubes I currently have on hand....
 
Ok, here's the latest update as I try and get this rig ready for Saturday's audition....

The louder I drive this amp, the better it sounds. Everything right now is working fantastically...
 
Robert Herndon said:
I was thinking that, but that tube in that position was recommended by several amp techs and even Eurotubes as well.

This was an interesting read by Myles Rose...(5751 is recommended in V4 here too!)

http://www.guitaramplifierblueprinting.com/files/Phaseinverter.pdf
Click to expand...
Ha ha... I'm almost pretty sure that Myles Rose (Original Groove Tube honcho) wrote that article before the DSLs or TSLs and many other super high gain amps came onto the market.

But if a 5751 in the PI sounds good to you, then it is good. I assume that I would be taking a different approach, but then again I've never had the opportunity to mess with any of the Marshall JCM2000 line of amps like your DSL. Almost wish I can score on a nice and used DSL for cheap, and see and hear what all the hoopla is all about... almost!
 
syscokid said:
Ha ha... I'm almost pretty sure that Myles Rose (Original Groove Tube honcho) wrote that article before the DSLs or TSLs and many other super high gain amps came onto the market.

But if a 5751 in the PI sounds good to you, then it is good. I assume that I would be taking a different approach, but then again I've never had the opportunity to mess with any of the Marshall JCM2000 line of amps like your DSL. Almost wish I can score on a nice and used DSL for cheap, and see and hear what all the hoopla is all about... almost!
Click to expand...

Again, I am in total agreement with sysco here...5751 in the PI spot of a hight gain amp = :poo: in my opinion. They're fine in Fender circuits, probably OK in vintage Marshall style, not good in modern high-gain, channel-switchers.
 
syscokid said:
Ha ha... I'm almost pretty sure that Myles Rose (Original Groove Tube honcho) wrote that article before the DSLs or TSLs and many other super high gain amps came onto the market.

But if a 5751 in the PI sounds good to you, then it is good. I assume that I would be taking a different approach, but then again I've never had the opportunity to mess with any of the Marshall JCM2000 line of amps like your DSL. Almost wish I can score on a nice and used DSL for cheap, and see and hear what all the hoopla is all about... almost!
Click to expand...
gball said:
Again, I am in total agreement with sysco here...5751 in the PI spot of a hight gain amp = :poo: in my opinion. They're fine in Fender circuits, probably OK in vintage Marshall style, not good in modern high-gain, channel-switchers.
Click to expand...

Totally possible....

What would you like to see - ideally - in V4 of a DSL40C????
 
smitty_p said:
Hmmm....

I see.

What don't you like about the stock tube configuration with all ECC83/12AX7 preamp/PI tubes?
Click to expand...

Nothing was wrong....I just bought a set of replacement tubes and I wanted some more gain, so I picked up a Genelex B759 to evaluate.

I also ordered a set of 7025WA's along with a matched pair of Electro-Harmonix EL-34's as back ups from Amplified Parts.
 
The B759 yields is the most significant change. Every other tube I used was subtle. I will never use anything but a Genelex B759 in V1.
 
Finally, the single most accurate and intelligible email from Marshall...

from:Kevin Drury <Kevin.Drury@usmusiccorp.com>
to:Robert VonHerndon <robertvonherndon@gmail.com>
date:May 15, 2019, 9:01 AM
subject:RE: Marshall DSL40C (Kevin K Dog)
mailed-by:usmusiccorp.comsigned-by:usmusiccorp.comsecurity:
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:Important mainly because it was sent directly to you.
Hi Robert,


Thanks for contacting us. Everything that you are describing sounds like this amp and the amps you have tired are performing correctly. The DSL40C is more geared to a rock amp type of tone. It was not really designed to be a super tight gain metal amp. I’m more of a metal player and I use the JVM series, JCM2000 series and JCM800 series of amps when I play. Have you tried using an OD pedal for a clean boost to possibly clean up the tone for a tighter sound? You would need to back the gain of for this and it would probably work better on the LEAD 1 mode.



KEVIN DRURY

MARSHALL SALES AND SERVICE SUPPORT

1649 BARCLAY BLVD. BUFFALO GROVE IL 60089
 
And from Marshall in England:

Hi Robert,

The 5751 is nothing more than a low noise, avionics grade 12AX7. It works well in the phase inverter position of some amps when a smoother, less brittle tone is desirable.
It will work fine in the DSL40C.

Cordially,

Colin

Marshall Amplification - Bletchley Repair HQ
Denbigh Road Milton Keynes MK1 1DQ United Kingdom
Tel: 01908 375411
Email: contact@marshallamps.com
 
from: Myles Rose via yahoo.com
to: "Robert H. Herndon" <10851man@gmail.com>
date: Jan 17, 2019, 1:47 PM
subject: Re: DSL40C Tubes
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There is really no right or wrong. It’s a matter of personal taste. A GE 5751 would be my first step, in V1 as well.

Myles
 
from: Doug Preston
to: "Robert H. Herndon" <10851man@gmail.com>
date: Apr 1, 2019, 12:07 PM
subject: Re: DSL40C Tube Recommendations
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Hi Robert,

V1 - Tung-Sol 12AX7

V2 - Ruby 12AX7AC5 HG

V3 - Ruby 12AX7AC5 HG

V4 - Sovtek 12AX7 LPS

That's my personal recommendation

Doug
 
Ok, so with some revised EQ settings and gain reduced on the 'Lead 1' (red channel lower gain setting) and the TS-9 set fro zero drive and full level, I am getting a wall rattling chug on both F# and Cm muted passages. Testing has been done all the way up to volume level of 4, which is about as loud as I can physically and sonically stand to be in the next room with the amp.
 
Original message --------
From: JACK SPINA - Marshall Service Center
Date:01/27/2018 11:30 AM (GMT-08:00)
To: 10851man@gmail.com
Subject: Re: Marshall DSL40C

Hi Rob,

Tubes are a matter of personal taste. As long as you are using a 12AX7 derivative you can do whtever you want. I've experimented with lots of tubes in the P.I. I always go back to either a 1980s production GE5751 or a JAN Philips 12AT7. The Sovtek 12AX7LPS is popular, but it isn't as sweet. None of these tubes will harm the amp.

Jack
 
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