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Author Topic: Diagnosing a problem.  (Read 18369 times)

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Harley Hexxe

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Re: Diagnosing a problem.
« Reply #30 on: Time Format »

I couldn't agree with you more MJMP, the last batch of tubes I bought were all through Doug's. So far, so good.
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PrimalScream91

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Re: Diagnosing a problem.
« Reply #31 on: Time Format »

Thanks for the input guys!  :thumb-up:

So when I go to order my new set, would it be worth it to get a Matched Pair? Balanced Triodes? High Gain?
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MarshallJMP

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Re: Diagnosing a problem.
« Reply #32 on: Time Format »

I always ordered the high gain balanced triodes types.
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Harley Hexxe

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Re: Diagnosing a problem.
« Reply #33 on: Time Format »

Thanks for the input guys!  :thumb-up:

So when I go to order my new set, would it be worth it to get a Matched Pair? Balanced Triodes? High Gain?

 Matched sets of tubes really matter only in Power Tubes. It's not really that kind of an issue with preamp tubes. In fact, there are many people here who use different pairs of tubes in their equipment to control the gain structures more to their liking.

   Typically, in preamp tubes, it's important to have the mu rating on Triode 1 equal to or less than the mu rating on Triode 2, (Mutual Inductance). The preamp tube will just sound bad if Triode 1 is higher.
   This is why many of the members here use different preamp tubes in their gear, they might use a medium gain tube in V1, and a higher gain tube in V2 for a smoother cascading gain structure. On the other hand, They might reverse that for a more abrasive gain structure. It's all subjective to taste. In stock preamps, I like to use strong gain rated tubes because it still produces good clean tones with slight differences in the EQ, (depending on the tubes I use), and still gives me good overdrive/distortion tones. The exception to that is the MP-2 since it has much higher distortion ratings as a stock unit.
   Modded MP-1's are an open canvas as far as tube rolling goes. I only have a 3TM which I'm using with my stock MP-1 just to give me the extra gain when I go into a solo. It's a combination that works well for what I need.

     Harley 8)
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PrimalScream91

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Re: Diagnosing a problem.
« Reply #34 on: Time Format »

Right on!  :thumb-up:

I'm thinking about pulling the trigger on some Mullards, I'll be sure and post what I think!
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rabidgerry

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Re: Diagnosing a problem.
« Reply #35 on: Time Format »

I had the same issue with my stock MP1  (now roided up to an MDRT/Noise Mod hellhound)

I used output B when A seemed to fail on me.  I intend to replace Output A, but recently it has been working fine.  So probably just needed a clean.

Boy you MP1 is dirty inside lol

My stock MP1 has the original tubes in there still.  I really like them.  When they die I will put in the TADs that Systematic Choas recommended, these are the closest thing to the stock tubes in the MP1 you see.

this is the model: TAD 12AX7A-C RT001
« Last Edit: Time Format by rabidgerry »
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rnolan

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Re: Diagnosing a problem.
« Reply #36 on: Time Format »

Hey RG, Those stock tubes went forever, great tubes for the MP1.
Hey PS91, Check out DTs FAQs, a good read  :thumb-up:
From Dougs FAQs:
http://www.dougstubes.com/faq#z1
Balanced:  When the plate current draw of each triode is the same, we refer to that as having balanced triodes.

High Gain:  Tubes that measured to have higher gain.

Matched:  Each triode of the preamp tube has matching gain.

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Harley Hexxe

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Re: Diagnosing a problem.
« Reply #37 on: Time Format »

Hey RG, Those stock tubes went forever, great tubes for the MP1.
Hey PS91, Check out DTs FAQs, a good read  :thumb-up:
From Dougs FAQs:
http://www.dougstubes.com/faq#z1
Balanced:  When the plate current draw of each triode is the same, we refer to that as having balanced triodes.

High Gain:  Tubes that measured to have higher gain.

Matched:  Each triode of the preamp tube has matching gain.

Richard,

    That is in reference to matched triodes in the preamp tubes. Primal's question was about a matched PAIR of tubes in the preamp which doesn't apply here.

    Harley 8)
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PrimalScream91

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Re: Diagnosing a problem.
« Reply #38 on: Time Format »


Boy you MP1 is dirty inside lol


"Was" dirty inside! I cleaned that bastard out! :lol:
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Harley Hexxe

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Re: Diagnosing a problem.
« Reply #39 on: Time Format »


Boy you MP1 is dirty inside lol


"Was" dirty inside! I cleaned that bastard out! :lol:

    Good work :thumb-up:
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rnolan

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Re: Diagnosing a problem.
« Reply #40 on: Time Format »

Hey Harley, yeah I understood that, and you answered it in your 1st post ? IIRC, as in this scenario it's not important as is an input stage not a push/pull output stage. I put the other stuff there to help understand the other variables. e.g. the difference between matched pair and matched triodes.

Go PS91, it was pretty dirty  :facepalm: , it will like for a good clean  :thumb-up:
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rabidgerry

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Re: Diagnosing a problem.
« Reply #41 on: Time Format »


Boy you MP1 is dirty inside lol


"Was" dirty inside! I cleaned that bastard out! :lol:

Good man!  Glad to hear it :)
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"whadda ya want? we want Heavy Metal"

Guitars:1986 Westone Dimension IV, 1989 Korean Squier Fat Strat Silver Series, 1998 Korean Squier Fat Strat, MIM Fender Fat Strat - FR, Squier Stagemaster Deluxe - Thru Neck x 2, Squier Stagemaster 22 Fret - 1st Gen, 1999 Squier Showmaster - Anniversary Edition, Squier Showmaster, Tokai FV40 Flying V

Effects:  Ada Mp1, Peavey Rockmaster, Boss GX700 Boss SX700 * Amps:   Rocktron Velocity 300 - Koch ATR4502 - Peavey Classic 50/50
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PrimalScream91

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Re: Diagnosing a problem.
« Reply #42 on: Time Format »

Got the new tubes in today, matched set, high gain, balanced triodes, the Mullards won out. It might be the snake oil talking, but it definitely seems like my amp has been opened up.
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Harley Hexxe

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Re: Diagnosing a problem.
« Reply #43 on: Time Format »

   I'd say that is a pretty good indication that it was time for a new pair. Enjoy!


          Harley 8)
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rnolan

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Re: Diagnosing a problem.
« Reply #44 on: Time Format »

   I'd say that is a pretty good indication that it was time for a new pair. Enjoy!
+ 1  :thumb-up: . It's also a feature of those longplates, they are a very "open" tube/soundscape (which is not what everyone wants). They'll also improve a bit as they burn in.  I've got a few pairs arriving tomorrow (hopefully) for my MB1s.
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