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Author Topic: New Tubes Advice  (Read 115099 times)

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El Chiguete

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Re: New Tubes Advice
« Reply #120 on: Time Format »

Should I consider a mullard with a red jacket to achieve this in OD2?

What's a red jacket?
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trader144

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Re: New Tubes Advice
« Reply #121 on: Time Format »

it was a mistake; i modified my post
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rnolan

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Re: New Tubes Advice
« Reply #122 on: Time Format »

Hey El, MJMP will get to it LOL.
Hey David, interesting conversation, and I get where your coming from.  Kind of ties in with what SC is doing with a TAD in V1 and NOS Mullard in V2.
So far I've gone for 2 Mullard long plates in my MP2s (and very happy with them BTW), after the posts of late though and playing my Epihone SG (Gibson 57 re-issue PUs) through them the other night (they are so huge), I'm considering going for 2 different tubes.
I think IIRC from what MJMP explained re the way the MP1 tube stages work, that you thoughts are generally correct, OD2/V2 is kind of the master vol (ish) and the main tone is set in OD1/V1 (= tube screamer ish).
Now SC is using the TAD for initial tone/distortion and using the very open 3D Mullard to follow. I was thinking (also based on other posts) to go the other way, Mullard V1, TAD or maybe tight 2d Boogie STR (JJ) in V2. However SC's idea is better gain structure (2D > 3D) will allow the sound to expand.  I'll give both a go and let you know.
MikeB and I are coming up for a tube rolling session (his MP1, My MP2)
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El Chiguete

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Re: New Tubes Advice
« Reply #123 on: Time Format »

MikeB and I are coming up for a tube rolling session (his MP1, My MP2)

This should be a live webcast for all of us to see and hear! jeje
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'81 Kramer Pacer Standard
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MarshallJMP

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Re: New Tubes Advice
« Reply #124 on: Time Format »

Well the signal flow is a bit different,so it goes like this;

Input to input buffer then into a SS preamp (the famous U4 opamp ,gain of this opamp is controlled by OD1 and T2) then for clean tube the signal goes to the first tube unaffected but in dist tube a mid filter is applied,so you have a clean boost (clean tube) or a mid boost (dist tube).The signal from V1 to V2 is controlled by OD2 and T1.T1 and T2 are the trimpots that set the range of  OD1 and OD2.

V1 has 2 modes,in clean tube ,only the high frequencies are boosted,in dist tube it's full blast  >:D

A tip;try to replace C16,C12,C7 and C6 on the tubeboard with 10µF caps,this will lower the hum and it cleans up the sound a bit.Best is to use panasonic NP caps (non polar).
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Systematic Chaos

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Re: New Tubes Advice
« Reply #125 on: Time Format »

Good that MJMP mentions the U4 opamp.
IIRC part of the standard noise-mod is to replace the "standard" TL072 dual opamp that comes in the U4 slot with a socketed BurrBrown OP2604AP.
The OP2604AP is well known amongst DIY'ers to give a more "tube-like" warm sound/response when used in OD stages.
If you´re after a more clean/hi-fi/open yet tube-like kinda character, the OP2134 is a good alternative.
I´ve used that IC when modding some OD stomps (TS, Marshall Jackhammer,...) in order to provide a more transparent sound when used on the front end to boost/tighten up tube amps.
YMMV.....
« Last Edit: Time Format by Systematic Chaos »
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trader144

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Re: New Tubes Advice
« Reply #126 on: Time Format »

Great info thank you for sharing

Given SC's post on the TAD 12AX7A-C RT001 and the description on the site, I ordered one and will try this next to a Mullard.
I also listened to many 12AX/AY/AU/5751 videos on youtube and all were good, especially the 5751.

It will be interesting to see if there is a big difference between the new TAD and the original MP-1 tubes that still seem to be good.

I really like the Mullards, but after having 2 of the 3 mullard reissues I have bought from different vendors go bad I am a little hesitant on their reliability.

David

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MarshallJMP

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Re: New Tubes Advice
« Reply #127 on: Time Format »

IIRC part of the standard noise-mod is to replace the "standard" TL072 dual opamp that comes in the U4 slot with a socketed BurrBrown OP2604AP.

Small correction,the original U4 opamp is a NE5532.
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trader144

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Re: New Tubes Advice
« Reply #128 on: Time Format »

My 3rd Mullard Reissue quit working today; it was in V1.

Anyone have any ideas why the Mullards keep dying?

The original tubes still work.
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MarshallJMP

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Re: New Tubes Advice
« Reply #129 on: Time Format »

Is your mp-1 modded?
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trader144

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Re: New Tubes Advice
« Reply #130 on: Time Format »

no it is all stock.
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MarshallJMP

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Re: New Tubes Advice
« Reply #131 on: Time Format »

Ok i know tha EH's die alot in a 3TM and i tought since both are russian tubes,maybe these fail too.But since it's not modded...
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trader144

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Re: New Tubes Advice
« Reply #132 on: Time Format »

Given that other tubes work, I guess the Mullard reissues either have quality issues, or they do not survive against my stock board components.

Since I gotta have the Mullard sound, but can't change tubes every month, I will try an alternative: Groove Tubes GT-12AX7-M Mullard-style ECC83 Preamp Tube

David
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El Chiguete

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Re: New Tubes Advice
« Reply #133 on: Time Format »

Yeha but I'm no expert on tubes... but is it normal to have tubes go bad after a month??? I don't think so.
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Before you see the light, you must die!!!

'87 Kramer Stagemaster Custom
'81 Kramer Pacer Standard
custom made Les Paul
ADA MP1
Rane MPE 28
Lexicon MPX-G2
Epiphone Valve Jr. moded!!!

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MarshallJMP

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Re: New Tubes Advice
« Reply #134 on: Time Format »

Well i had new tubes fail within a minute,so yes it can happen but 3 times is alot.Maybe the problem is the low heater voltage that destroys these?
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