Tube Amp Doctor Releases the TAD RT001-BPD

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surfnorthwest
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Tube Amp Doctor Releases the TAD RT001-BPD

Postby surfnorthwest » 09 Jan 2018, 06:53

These new tubes from TAD are being sold now and should be worth a try. I am going to grab a couple to sample when I visit them at NAMM.

Worms, Germany (January 8, 2018) -- The newest addition to Tube Amp Doctor’s well known line of high quality premium tubes will be first introduced to the American market at NAMM 2018.

Perfectly symmetrical systems will guarantee for balanced signal amplification as well as balanced current draw of both triodes. This special selection and the fact that the TAD 12AX7A-C is one of the strongest tubes around, make the TAD RT001-BPD the perfect choice for the phase inverter/driver position in any tube-driven amplifier.

For guitar amps these can be used in any position.


Tight deep bass, complex lively mids and silky top end

Improves overall definition

Great sustain

Harmonic overdrive and maximum dynamics


The TAD 12AX7A-C BALANCED PHASE DRIVER (RT001-BPD) can replace any 7025, 12AX7WA, 12AX7WB, 12AX7LPS, 12AX7EH, ECC83 or E83CC. Suggested retail price is $17.50 and it can be ordered directly from TAD or their US-distribution.

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Re: Tube Amp Doctor Releases the TAD RT001-BPD

Postby Anitoli » 09 Jan 2018, 07:30

You can tell by the silver side metal thing on the outside of the plate that these are Chinese. If they are screened right Chinese tubes can kick ass. I am still using 5 of the Marshall branded Chinese tubes that originally shipped with my 6100. Even after 10 years of heavy use these tubes were still testing above 100 for gain on both triodes and measuring -85db or higher for noise and measuring over 2600 for transconductance.

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Re: Tube Amp Doctor Releases the TAD RT001-BPD

Postby burnsy » 10 Jan 2018, 08:12

Be very interested to see what these do.
I have always used chinese tubes and have always had great results with them. You need to go to companies like Ruby, Penta and T.A.D. to get them as they will test and sift out the bad ones (of which there are a lot).
I have nevery fully subscribed to the idea of a balanced P.I. tube. There are plenty of arguments for and against the need to be balanced in this position. Some even say an unbalanced tube sounds better.
Years ago, the 'go to' tube for the P.I. in your old Marshall head was a Sovtek 12AX7LPS. Not very good in other positions but sounded well for this purpose. More out of habit, I have used these ever since and have bever worried about the balanced option.
If anybody tries this new offering from T.A.D., be good to know how it performs for you.
Marshall DSL401 Combo
Ampmaker 18w Combo
Orange Tiny Terror 'Hard Wired'
G12C 2x12 Cabinet

Previous Amps:
Vox AC30, Sound City 50, JTM45, JMP50, 9004, DSL50, 9001, EL84 20/20, Class 5, 2266

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Re: Tube Amp Doctor Releases the TAD RT001-BPD

Postby Anitoli » 10 Jan 2018, 08:39

I always found it curious that Fender used 12at7's for the PI instead of a 12ax7. From what i understand, the 12at7 is lower noise tube than an ax7 and supposedly has a better input sensitivity to AC. For certain even though the at7's MU (gain) is only 60 compared to the ax7's 100 it will still deliver enough signal to drive a 100w power amp into saturation.

What is nice about the Chinese 12ax7's is they seem to be able to handle very high plate voltages unlike other tubes that die in the PI spot.

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Re: Tube Amp Doctor Releases the TAD RT001-BPD

Postby jeffsmusic4919 » 12 Jan 2018, 15:25

Anitoli wrote:You can tell by the silver side metal thing on the outside of the plate that these are Chinese. If they are screened right Chinese tubes can kick ass. I am still using 5 of the Marshall branded Chinese tubes that originally shipped with my 6100. Even after 10 years of heavy use these tubes were still testing above 100 for gain on both triodes and measuring -85db or higher for noise and measuring over 2600 for transconductance.


I wish I knew what those side silver things are called, it is a dead give away. Someone once told me they are there to help hold the plates in place in hopes of reducing the chance of micro-phonic tubes.

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