Freestompboxes Baja Mini Tube Overdrive  [verified]

Original effect designs complete with verified schematics, layouts and instructions. All project were freely contributed by members and cannot be used for commercial purposes without consent of the respective owners of the copyright.
dimych
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Post by dimych »

bajaman wrote:maybe I am blind, but i have never been able to see the bar on the bottom of the tube :?
bajaman
That bar is embossed on the bottom of tube, just on the glass, also these tubes exist with color dot opposite to one of anodes

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DrNomis
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Post by DrNomis »

I just bought myself a set of 4 X 6N17B-V tubes off eBay, cost me about $18.00 Au all up...... :thumbsup

Going to have a go at building this little project.... :thumbsup


Bajaman, do you still stock PCBs for this project?...... :thumbsup
Genius is not all about 99% perspiration, and 1% inspiration - sometimes the solution is staring you right in the face.-Frequencycentral.

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DrNomis
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Post by DrNomis »

Okay, so my 4 Russian 6N17B-V valves arrived in the post at about 8 am today, now all I need are a set of PCBs and all the other bits to make one of these mini tube overdrive pedals......... :horsey:
Genius is not all about 99% perspiration, and 1% inspiration - sometimes the solution is staring you right in the face.-Frequencycentral.

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rasta_maleek
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Post by rasta_maleek »

:applause: congratulation Dr. you will be one of the pleased owners of a baja tube driver

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DrNomis
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Post by DrNomis »

rasta_maleek wrote::applause: congratulation Dr. you will be one of the pleased owners of a baja tube driver

I've already built the full sized version so I'm interested to see how my build goes, as it just so happens I've got an enclosure that already has most of what I need minus a circuit board, so I'm going to see if I can come up with a suitable vero/stripboard layout.....stay tuned...... :thumbsup
Genius is not all about 99% perspiration, and 1% inspiration - sometimes the solution is staring you right in the face.-Frequencycentral.

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salvovulcan
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Post by salvovulcan »

someboby knows how is Bajaman? it's long time I'm not be able to contact him.
Ciao a presto
grande

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bajaman
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Post by bajaman »

I'm fine thanks :wink:
bajaman
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DrNomis
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Post by DrNomis »

bajaman wrote:I'm fine thanks :wink:
bajaman


Good to know you're okay mate, we were missing you..... :thumbsup
Genius is not all about 99% perspiration, and 1% inspiration - sometimes the solution is staring you right in the face.-Frequencycentral.

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bajaman
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Post by bajaman »

I'm always here :wink:
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bajaman
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Post by bajaman »

still here :thumbsup
be kind to all animals - especially human beings

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DrNomis
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Post by DrNomis »

Okay, I managed to build a veroboard version of this project and it worked first time, had to draw a schematic based on the PCB, not sure if I got it right but it does seem to work, haven't tried it out with a guitar yet though...... :thumbsup


Bajaman, would you be able to post the schematic for us by any chance?, I'm interested in checking to see if I've got the biasing right, one tube stage seems to be biasing-up lower than the other with the result of asymmetrical clipping, I did some voltage measurements of the tube voltages with respect to circuit ground and here's what I'm getting in my build, do these sound about right to you?:


I'm using a 9V AC / 800mA plugpack adaptor to power my build..... :thumbsup


+V Supply = +11.93V

-V Supply = -11.60V


First Triode Stage:

Cathode = -11.60V

Grid = -10.64V

Anode -1.69V


Second Triode Stage:

Cathode =-11.60V

Grid =10.63V

Anode = -6.33V


All other voltages look normal to me....... :thumbsup
Genius is not all about 99% perspiration, and 1% inspiration - sometimes the solution is staring you right in the face.-Frequencycentral.

GajaKopa
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Post by GajaKopa »

Hello!

If I really can not find a 10V AC adaptor, what should be a better substitute: 9V or 12V? Do I need to change anything if I am going to use it with 9V or 12V?

spoontex
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Post by spoontex »

Hello,

I can use 15vdc instead of 10vac? Maybe changing heaters resistor to 30R?


Any other change?

Thanks.

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modman
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Post by modman »

spoontex wrote: 10 May 2020, 19:51I can use 15vdc instead of 10vac? Maybe changing heaters resistor to 30R?
Hey, it's best to post questions in the relevant thread, it notifies people who have posted in the thread.
I merged the message... Maybe DrNomis will see this, he's gone the same route:
DrNomis wrote: 28 May 2014, 12:23I'm using a 9V AC / 800mA plugpack adaptor to power my build..... :thumbsup (..) All other voltages look normal to me....... :thumbsup
But he hasn't been online the last year.
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ppluis0
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Post by ppluis0 »

Hi spoontex,

You must use an AC adaptor due this design have a trick to obtain dual supplies from one single power input.

Cheers,
Jose

spoontex
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Post by spoontex »

I see... Maybe with a voltage divider, omitting rectifier and increasing heater drop resistor.

And anyone have the drill layout for the 1590b?

Thanks.

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Post by brain_lp »

Hello.. After almost 10 years.. I build this.. :horsey:
Still waiting the tubes from ukraine 6n16b

spoontex
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Post by spoontex »

Hello,

anyone have the drill template??

Thanks!!

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Post by brain_lp »

brain_lp wrote: 18 Jun 2020, 22:35 Hello.. After almost 10 years.. I build this.. :horsey:
Still waiting the tubes from ukraine 6n16b
mine doesnt work.. 😢

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