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Lets get Technical > All Things Tube All about preamp and power amp Tubes.

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Author Topic: Twin Tube GFX-1  (Read 5295 times)

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AxeHarmony

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Twin Tube GFX-1
« on: Time Format »

Twin Tube GFX-1  always wanted one as I had a GSP-21 back in the 80's.
my old gsp-21 foot controller works perfect with this unit...

i really think Digitech checked out the MP-1 before making this pre... ??? lots of similar parts and I basically did the same noise mod to it and some other obvious stuff ...  and quite an impressive pre, really - real fun to play with as it has a full array of effects, the flanger is awesome while the delay and reverbs need to be subtle ...

matbe some mods to this one ?  ... ...
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Dante

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Re: Twin Tube GFX-1
« Reply #1 on: Time Format »

I bought one of those for a backup when my MP-2 was at a local shop, and used it with my ol' B200s. It was a very good preamp, but I remember it being a pain to program (something about scrolling through all the settings to get to save? - I can't remember specifically)

That said, if I see another one pop up on Criagslist, I'll probably grab it ;)

BTW: I sold mine to pay for my MP-1 Classic  :metal:
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ADA Gear: MP-1 Classic | MP-2 | Viper Combo | MicroTube 200 | MicroFet | MXC w/Quad Switch

AxeHarmony

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Re: Twin Tube GFX-1
« Reply #2 on: Time Format »

neat how things come together, Dante did you notice how much cleaner this unit is than the ADA's ?? sure a little less organic sound than the ADA's but damn it's a clean low noise/hum compared to the ADA's  !!!
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Dante

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Re: Twin Tube GFX-1
« Reply #3 on: Time Format »

Yes, I did. It's a very quiet unit on the dirty stuff fo sho.

However, as you state, the 'organic' feel of it left a bit to be desired in a live situation. Many of the gear I try sounds fantastic by itself, but the true test is the BAND. How does it fit in the mix? How does it cut through the mix (or not)? Those are the questions that determine actual functionality of gear.

That said, I love Love LOVE my MP-2. I have for years. The MP-1 Classic still cuts through better to my ears, but the MP-2 has a LOT more bells & whistles.

I like ringing bells and blowing whistles
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ADA Gear: MP-1 Classic | MP-2 | Viper Combo | MicroTube 200 | MicroFet | MXC w/Quad Switch

sebastien

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Re: Twin Tube GFX-1
« Reply #4 on: Time Format »

i had one some months ago, i found it was "old date" sound, with nuch such gain as ADA mp1 or 2
but quite good preamp.
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Sparker

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Re: Twin Tube GFX-1
« Reply #5 on: Time Format »

Just got one of these, super-cheap from EB, ... but super high gain squealing as well (probably why super-cheap!!! Gotta love EB). Anyway, changed the 'hooting' tubes out and I'm really pleased with it, to my ears sounds like rich organic overdrive plus super high gain as well. Totally agree Digitech must have been checking out the ADA MP's when pushing this one out (weird with 2 transformers eh?). Strange none of their subsequent rack tube preamps sounded as good. Axe - I would like to hear more about your mods to this pre (I see the twisted wires to the tube board and the changed out caps), have you got any more mods in there? Got any schematics as well? I've emailed Digitech for some, but won't hold my breath.

Cheers

Mike
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ADA Gear: MP-1 Tube Board

Sparker

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Re: Twin Tube GFX-1
« Reply #6 on: Time Format »

Digitech came good!! Got schematics if anyone needs them. Still loving this thing btw.
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ADA Gear: MP-1 Tube Board

rnolan

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Re: Twin Tube GFX-1
« Reply #7 on: Time Format »

Go Sparker, good to hear, I've always had a soft spot for Digitech and my IPS33 has always been solid and still going strong 20+ years later...
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Studio Rig: MP2/MB1 > Eurorack UB2442FX-Pro > TC M-One XL > Behringer Truths (with Truth Sub) / QUAD ESL 63s
Live Rig: MP2/MB1 > Alesis Quadverb > Alesis Midiverb 4 > Yamaha AM802 > B200s/Carvin TS100/DCM200L > ADA Split Stacks/Mesa P112s

Dante

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Re: Twin Tube GFX-1
« Reply #8 on: Time Format »

Whelp, here's an OLD bump...

I just picked up one of these GFX-1 units for less than $100. I figured, why not? It does not disappoint. I don't remember it sounding this good when I had one before.

When I brought it home, I could hear something inside rattling around....hmm... I opened up the case (each screw a new experience - lol) Man, it was dusty inside...and many loose screws. The tube board had three screws, one of which actually had a nut. DOH! I tightened that up as much as I could and it's much more solid now. The tubes were covered in dust and gunk - I wiped them off with a clean rag and found out they are Groove Tube GT 7025 tubes. Not particularly great in my Microtube power amp, but (from what I hear from Harley), they are good preamp toobs. Circa 1993-5 (I think - correct me if I'm wrong), they sound great.

I'm loving this thing and I'm gonna keep it as an emergency backup rig or a fly rig. Does it have what I NEED for a gig? Yes. Does it have everything I WANT for a gig? no...almost...
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ADA Gear: MP-1 Classic | MP-2 | Viper Combo | MicroTube 200 | MicroFet | MXC w/Quad Switch

rnolan

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Re: Twin Tube GFX-1
« Reply #9 on: Time Format »

 :thumb-up: :whoohoo!:
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Studio Rig: MP2/MB1 > Eurorack UB2442FX-Pro > TC M-One XL > Behringer Truths (with Truth Sub) / QUAD ESL 63s
Live Rig: MP2/MB1 > Alesis Quadverb > Alesis Midiverb 4 > Yamaha AM802 > B200s/Carvin TS100/DCM200L > ADA Split Stacks/Mesa P112s
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