BK Butler - Tube Driver  [schematic]

Discussion regarding early stompbox technology: 1960-1975 Please keep discussion focused and contribute what info you have...

Re: BK Tubedriver tube

Postby DrNomis » 03 Jan 2012, 09:48

theehman wrote:I thought you were talking about one of these:
img58.jpg


They use 6AV6/6AT6 tubes




I'm interested in building one of these 1979 Tube Drivers, and I'm wondering if anyone knows where I could find a schematic for this model... :hmmm: :scratch:
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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Re: BK Butler - Tube Driver

Postby MWichni » 15 Jan 2012, 14:25

Hi guys, I will upload a schematic and pcb layout from a traced Chandler Tube Driver soon.
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Re: BK Butler - Tube Driver

Postby Kap'n » 16 Jan 2012, 03:54

How do these differ from the Paul C "Mini Boogee" pedal?
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Re: BK Butler - Tube Driver

Postby ppluis0 » 16 Jan 2012, 04:41

The Mini Boogee has two 12AX7 inside, as can be seen in the following images found in the web:

Image

Image

Looks like this unit works with bipolar low voltage supply as the Tube Driver that were constructed after this line of pedals.

Will be interesting to trace one of this units due I cant´t see any transistor or op amps (at least in the first photograph), and all the amplification looks to be done with tubes.

Any forum member has acces to one of these oldies ??

Cheers,
Jose

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Re: BK Butler - Tube Driver

Postby MWichni » 16 Jan 2012, 08:33


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Re: BK Butler - Tube Driver

Postby ppluis0 » 17 Jan 2012, 03:30

Hi Mwichni,

Thank you for the schematic you posted...!!!!!!!

Can you post the link of the thread where this diagram was found, in order to read the opinions about this pedal ??

Thanks in advance, and best regards,
Jose
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Re: BK Butler - Tube Driver  [schematic]

Postby pete_el34 » 25 Jan 2012, 16:22

Hi all!

As promised here is the schematic of the early tube driver traced from the guts posted on this thread.
The most significant differences compared to the new RI edition are:

---> R14: On the new RI version it increased from 2,2k to 22k. Several people reported that the tone stack reacted different on the new version vs. the old one. This value change is the reason.
Maybe 2,2k works better when one rolls off both the Bass and High a la Eric Johnson??
---> R7,R8: From the pictures the plate resistors look like 6,8k. I was expecting 47k here. Was this unit moded for lower gain tubes? "Tube Driver" can you please measure the bias voltage in both R7 and R8?
---> R12: increased from 10k to 22k in the new RI Edition. This gives more gain/less headroom.
---> C3: Was not identified on the guts pictures. I'm guessing its value is 120pf. "Tuberiver" can you confirm this?

The new RI version is better than the old one regarding PWR Supply, noise etc.. But i would maybe change R14 and R12 to the old values and listen what happens.

If anyone there has one of this early tube drivers please post the guts. I want to check the values of R7, R8, R12, R14, C3 on other units.
With the files that i attach here is very easy to find the components on the PCB.

Enjoy! ;)

BK Butler Early Garage Made Tube Driver Schematic.png


BK Tubedriver 003 PCB Top Layer.png


BK Tubedriver 016 PCB traces only.png


BK Tubedriver 016 PCB traces and caps.png


BK Tubedriver 016 PCB full render.png
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Re: BK Butler - Tube Driver

Postby pete_el34 » 25 Jan 2012, 17:01

Forgot to mention before, if you have a Chandler Wall Mart Tube driver you can easily convert it to a "authentic" tube driver by rebuilding the tone stack section.
When chandler copied the BK Butler design they totally messed up the Tone Stack Section.. All schematics to compare the different versions are here on this thread ;)
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Re: BK Butler - Tube Driver

Postby pete_el34 » 25 Jan 2012, 17:03

On the post above of course i was refering to the 4 Knob Chandler Tube Driver with Wall Mart.
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Re: BK Butler - Tube Driver

Postby pete_el34 » 26 Jan 2012, 11:12

MWichni wrote:Hi guys, I will upload a schematic and pcb layout from a traced Chandler Tube Driver soon.


Hi! Do you have the guts of that Chandler Tube Driver? Can you post them?

Thanks!
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Re: BK Butler - Tube Driver

Postby MWichni » 26 Jan 2012, 18:37

I try to post something during this weekend. Sorry for the delay but I don't have much time at the moment. Thanks for your kind words.
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Re: BK Butler - Tube Driver

Postby DougH » 27 Jan 2012, 22:06

Aron has a schem for the early BK circuit I believe. That's what I based my Pentode Driver on.
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Re: BK Butler - Tube Driver

Postby MWichni » 27 Jan 2012, 22:34

If someone can please verify it. I built one but I don't remember which pcb file was the final one.
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Re: BK Butler - Tube Driver

Postby andregarcia57 » 13 Mar 2012, 01:19

MWichni wrote:If someone can please verify it. I built one but I don't remember which pcb file was the final one.


is checked?
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Re: BK Butler - Tube Driver

Postby MWichni » 13 Mar 2012, 08:29

I'll check if it was this pcb file that I used for etching my tube driver.
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Re: BK Butler - Tube Driver

Postby imaradiostar » 28 Apr 2012, 20:22

I once owned one of these and sold it on ebay because my rackmounted tube driver sounded better. It wasn't a bad pedal but it required very careful tube selection to sound decent. I noticed an error (really two) compared to what I had in mine- the 220k from the wiper of the treble pot to the bottom of the treble pot and the wiper of the bass pot should be wired to one end of the bass pot- I don't recall which.

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Re: BK Butler - Tube Driver

Postby imaradiostar » 28 Apr 2012, 20:23

I meant to say the 200k is wired between the wiper lug and the bottom lug of the treble pot, changing the value of the pot as you sweep the control.

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Re: BK Butler - Tube Driver

Postby imaradiostar » 28 Apr 2012, 20:33

ugh, how do I edit my bad posts? I keep saying it wrong!

-the 220k resistor is connected from the wiper of the treble pot to the bass end of the treble pot

-the bass pot is wired as a variable resistor with one end tied to the middle lug so that when the control as at max, the pot is at its full value.

jeez.

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Re: BK Butler - Tube Driver

Postby eruarou » 30 Apr 2012, 20:38

MWichni wrote:If someone can please verify it. I built one but I don't remember which pcb file was the final one.


anyone know if this thing is right? :D
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Re: BK Butler - Tube Driver

Postby Stratocaster-Sam » 29 Jul 2012, 23:27

eruarou wrote:
MWichni wrote:If someone can please verify it. I built one but I don't remember which pcb file was the final one.


anyone know if this thing is right? :D


Anyone?...
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