A finished Tube Amp (5w) and Dr. Boogie

gtudoran · July 05, 2009, 08:44:23 AM

Hello guys... just finished the 2nd build from ax84... as always... no faults..
I just recorded a little video with the amp (is just a prototype i will have a nice wood enclosure).

The guitar is a Ibanez SA120 with SD pickups and drop D, i used a 2x12" goodmans cabinet and at the and (you will figure it out) i used a modified dr. boogie hi-gain pedal.

I ask you to accept my apologize the video presentation is in Romanian as it is made for my fellows from Romania.

All best wishes and a lot of thx for you guys and for the excellent work you make.

PS: a little modification from the original schematic: at the first preamp tube in cathode i used 2x22uF capacitors ( to decouple the 2 rezistors).

So here is the link: http://www.youtube.com/watch?v=OYyFfKJyrfM

All comments are welcomed. Best regards,
Gabriel Tudoran

petemoore · July 05, 2009, 09:00:25 AM

Fine Video, thank you, I even recognized a few words during the narration !
Don't try to 'English it up', I understood just fine and enjoy the language in the video !
Nothing can be more fun than a freshly made Little Tube Amp for playing while 'sitting on matress' !
I have something similar, but the tube sockets need replaced, using old ones isn't always the best choice.
Really nice cleans, the crunch kixx hard too !

punkin · July 05, 2009, 05:16:35 PM

sounds great! I think I heard you say gain

the language of music is truly universal

Derringer · July 05, 2009, 05:40:30 PM

which AX84 build is this?

I'm assuming it's the P1?

gtudoran · July 06, 2009, 12:56:56 AM

Thank you guys for you replays and for your time, no is not the P1 is the HI-OCTANE but the tone-stack and the cathode values for the first tube are not the same any more (as in original schematic). The tone-stack was replaced with a more Marshall one and the coupling cappacitors ware replaced with 22uF. In the original schematic there was way too much treble response and with my Squier Standard Strat was like a cat on a chalkboard.
I intend to make a tru 2 channels amp and to put it a FX-Loop (just for the sake of it). I already made the enclosure for it: matural wood see trough finish - i will post pictures and audio samples /video along with this.

Best regards,
Gabriel

arma61 · July 06, 2009, 02:35:54 AM

Quote from: gtudoran on July 05, 2009, 08:44:23 AM
.............. i used a modified dr. boogie hi-gain pedal.

hi there, good job m8

would you like to share those mods for dr. boogie ? I know there are a lot of mods, but I like the sound of your one, and cannot get mine to work in the "right way", it's howling like a wolf, I need to turn completely off my strato's trebble knob to get rid of the howling!!

thx
Armando

gtudoran · July 06, 2009, 02:45:23 AM

Sure man no problem, i will try to make a list with the difference from the original schematic... this will take a day or tow... deppending on the jobs i have.

Best regards, Gabriel

arma61 · July 06, 2009, 03:49:06 AM

thx Gabriel!

when you can, I'm on holiday atm so very few resource for building (sigh!)

Cheers
Armando

Derringer · July 06, 2009, 11:48:36 AM

Quote from: gtudoran on July 06, 2009, 12:56:56 AM
Thank you guys for you replays and for your time, no is not the P1 is the HI-OCTANE but the tone-stack and the cathode values for the first tube are not the same any more (as in original schematic). The tone-stack was replaced with a more Marshall one and the coupling cappacitors ware replaced with 22uF. In the original schematic there was way too much treble response and with my Squier Standard Strat was like a cat on a chalkboard.
I intend to make a tru 2 channels amp and to put it a FX-Loop (just for the sake of it). I already made the enclosure for it: matural wood see trough finish - i will post pictures and audio samples /video along with this.

Best regards,
Gabriel

Nice dude!

How dramatic of a difference were the 22uf caps compared to the stock 0.68 and 1 uf caps? I'm imagining the low end just began exploding from the amp! For the guitar you're using that's perfect. I love the way Strats sound when they have a punchy/thick low end.

How do you think you'll implement the FX loop? Solid state or tube buffer?

gtudoran · July 06, 2009, 01:19:09 PM

Hey thx man, the change was like ... very dramatic, and indeed the low end just popped out of nowhere

. I will use a tube buffer because i wanna preserve the "all tube" sentence

.

If you need any help or anything don't hesitate to ask... i will help you gladly.

Best wishes,
Gabriel

Derringer · July 06, 2009, 01:47:21 PM

well .. if you don't mind, I'd really like to see how the FX loop and channel switching comes along

questions that come to mind now ...

Does the PT supply enough current to support another small signal valve?

What kind of channel switching do you think you'll employ? like ... where will the signal inputs/outputs be for the separate channels?

gtudoran · July 06, 2009, 02:17:11 PM

Quote from: Derringer on July 06, 2009, 01:47:21 PM
well .. if you don't mind, I'd really like to see how the FX loop and channel switching comes along

questions that come to mind now ...

Does the PT supply enough current to support another small signal valve?

What kind of channel switching do you think you'll employ? like ... where will the signal inputs/outputs be for the separate channels?

The PT is calculate to supply 4 A for 6.3v tap and 800mA for the HV tap so, is enough for even more valves
I'm thinking about the 2 Channels... i think i will use another valve so it will be like: 1 ECC83 for clean channel and 2 ECC83(82 or 81) for the gain channel. The switching will be made with relays (i'm still looking for another switching method like... optical or another one)

The block schematic will be smth like input -> Clean Channel -> Tone Stack-> Power Stage -> Speakers
|_> Gain Channel ----^ -> Power Stage

I will try to use the same TS for both channels ... if it will not be a good idea i will make separate TS for the gain channel. So the input signal will be switched from the input jack and from the input power stage.
Hope i was clear enough about it... i will try to make a schematic tomorrow.

Best wishes,
Gabriel

Derringer · July 06, 2009, 03:27:36 PM

my mistake ... I was thinking you were going to implement all these things into the HI-Octane

That's a serious PT!

awesome man ... update us as you go if you have the time!

Brymus · July 06, 2009, 04:55:21 PM

Very nice indeed.
I watched your video before reading the rest of the thread and I noticed right away the low end was more than I expected.
I think its very cool that music is the common language here!
Keep rockin my Romanian Bro!

gtudoran · July 07, 2009, 04:02:49 AM

Quote from: Brymus on July 06, 2009, 04:55:21 PM
Very nice indeed.
I watched your video before reading the rest of the thread and I noticed right away the low end was more than I expected.
I think its very cool that music is the common language here!
Keep rockin my Romanian Bro!

Before that mod there was almost no bass response ... the sound was very sparky and with my strat the sound was waaaayyyy to high. I hope the music will be the universal language for all and in the near future we will forget about the war and all death.

Thank you a lot for your nice words.

Best wishes,
Gabriel Tudoran

tranceracer · July 07, 2009, 02:59:13 PM

Sounds Great!

jrc4558 · July 07, 2009, 03:55:51 PM

Foarte bine! Tu est' Gabi din 18watt?
Sounds really nice, mate!

gtudoran · July 09, 2009, 07:52:59 AM

Quote from: Constantin Necrasov on July 07, 2009, 03:55:51 PM
Foarte bine! Tu est' Gabi din 18watt?
Sounds really nice, mate!

No i'm not ...just the same name, as far i can see you are from Romania?

I look forward to do some talking (i added you in ICQ list)

Best regards,
Gabriel Tudoran

jrc4558 · July 09, 2009, 11:55:56 AM

Hey! No, I'm in Canada, Russian background. Just know a couple of words.

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A finished Tube Amp (5w) and Dr. Boogie