Author Topic: pix of Custom built guitar amps/cabs  (Read 387354 times)

mth5044

Re: pix of Custom built guitar amps/cabs
« Reply #840 on: March 06, 2019, 11:48:59 PM »



Oh my gosh. I feel things about this I havenít felt since...

amptramp

Re: pix of Custom built guitar amps/cabs
« Reply #841 on: March 07, 2019, 06:14:19 PM »
Hi!
just made a paint job on the original schematic...here you have it:



For a bigger image just copy the link and remove the last l before the dot

If you want to use a 12AX7 in the tremolo you can use the original tremolo section, with only 3 CR Stages.

As long as you have the filament centre tap available, I would connect it to some higher voltage like the cathode of the output tube.  This is often done to ensure any electron emission from the filament starts at a higher voltage so the grid will be much more negative and will shut it off.

rankot

Re: pix of Custom built guitar amps/cabs
« Reply #842 on: May 03, 2019, 11:49:22 AM »
As long as you have the filament centre tap available, I would connect it to some higher voltage like the cathode of the output tube.  This is often done to ensure any electron emission from the filament starts at a higher voltage so the grid will be much more negative and will shut it off.

If I use DC for heaters, is it better to connect heater's ground to output tube's cathode or not?
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amptramp

Re: pix of Custom built guitar amps/cabs
« Reply #843 on: May 03, 2019, 05:41:41 PM »
As long as you have the filament centre tap available, I would connect it to some higher voltage like the cathode of the output tube.  This is often done to ensure any electron emission from the filament starts at a higher voltage so the grid will be much more negative and will shut it off.

If I use DC for heaters, is it better to connect heater's ground to output tube's cathode or not?
[/quote

I would still connect the heaters to a higher voltage like the output tube cathodes because rectifying and filtering the AC heater supply would introduce higher harmonics of the power line frequency even though the fundamental would be gone.

rankot

Re: pix of Custom built guitar amps/cabs
« Reply #844 on: May 04, 2019, 10:02:57 AM »
If I got this right - for example, I have 9V DC available for heaters (as in normal pedal) and they need 6.3V. Which version is better (if any) - with heater ground slightly elevated to 2.7V with dropping resistors between heaters and ground, or heater ground at the same level as circuit ground, with dropping resistors between +9V and heaters?

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Toynbee

Re: pix of Custom built guitar amps/cabs
« Reply #845 on: June 23, 2019, 10:34:31 AM »

Marcos - Munky

Re: pix of Custom built guitar amps/cabs
« Reply #846 on: June 26, 2019, 08:42:31 PM »
Just finished this one. AX84 P1 with "alternative" tubes. I've used a 6N2P for the preamp tube, and a 6EM5 for the output tube (not pin to pin equivalent to a EL84). Also, my first experience on winding both power and output transformers.


« Last Edit: June 26, 2019, 08:46:09 PM by Marcos - Munky »

Ben N

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Re: pix of Custom built guitar amps/cabs
« Reply #847 on: June 27, 2019, 04:18:55 AM »
Just finished this one. AX84 P1 with "alternative" tubes. I've used a 6N2P for the preamp tube, and a 6EM5 for the output tube (not pin to pin equivalent to a EL84). Also, my first experience on winding both power and output transformers.


Is that one of those tone-metal cake tins?

Marcos - Munky

Re: pix of Custom built guitar amps/cabs
« Reply #848 on: June 27, 2019, 06:10:35 PM »
Yeah, it's a tin to bake cake/bread.

Thomeeque

Re: pix of Custom built guitar amps/cabs
« Reply #849 on: September 20, 2019, 08:26:00 AM »
 Hello,

 I needed minimalistic setup for my home looping and it led to the need of building FX loop feature into my MicroCube (there was simply no other way around :D).

 It was not that easy, as all from preamp to master volume happens inside the CPU, but I managed.

 
 
 
 Short sample

 More pics & schema

 Happy :), T.
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Ben N

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Re: pix of Custom built guitar amps/cabs
« Reply #850 on: September 22, 2019, 02:44:31 AM »
Tomas, you never fail to amaze.

Thomeeque

Re: pix of Custom built guitar amps/cabs
« Reply #851 on: September 23, 2019, 05:17:50 AM »
Tomas, you never fail to amaze.

 Oh, sweet, thank you, Ben! :)
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vigilante397

Re: pix of Custom built guitar amps/cabs
« Reply #852 on: September 23, 2019, 11:26:19 AM »
there was simply no other way around :D

Are you sure...? ???

Looks great though, nice work 8)
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deadastronaut

Re: pix of Custom built guitar amps/cabs
« Reply #853 on: September 25, 2019, 03:14:31 AM »
tomaz thats brilliant, i have a micro cube too, and a looper,

its always been a pain that the effects come after, so i can see why you did this....excellent work man.

(i was forced to use mine on clean channel with external effects and looper....)

so this is a nice minimal setup...very cool.  8)
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Thomeeque

Re: pix of Custom built guitar amps/cabs
« Reply #854 on: September 26, 2019, 10:35:24 AM »
Thanks, guys! :)

there was simply no other way around :D

Are you sure...? ???

 Well, depends. I really like preamps and effects built-in inside MC, it's just a perfect set for (my) home playing needs, and to be able to use them in combination with looper IMHO there is no other way. You can use it the way Rob describes, but then you loose most of what MC offers and setup is also more complicated.

tomaz thats brilliant, i have a micro cube too, and a looper, ..

 Then you should do it also! :icon_twisted: I can provide some more info, if needed, feel free to ask.

 Cheers, T.
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deadastronaut

Re: pix of Custom built guitar amps/cabs
« Reply #855 on: September 26, 2019, 10:43:08 AM »
hi T.

yes please, i'll have a go at it...

ive done a few mods to it already, added an on/off switch on top...as the one on the back was annoying.. :icon_rolleyes:

added a speaker on/off regardless of phones in...for recording out... 8)

and added fancy colour changing neo pixel leds around the face of it too.... ;D

so may as well go the full monty on it... :icon_mrgreen:
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https://deadastronaut.wixsite.com/effects

chasm reverb/tremshifter/faze filter/abductor II delay/timestream reverb/dreamtime delay/skinwalker hi gain dist/black triangle OD/ nano drums/space patrol fuzz//

Thomeeque

Re: pix of Custom built guitar amps/cabs
« Reply #856 on: September 26, 2019, 10:50:38 AM »
That's the spirit! :icon_lol:
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Thomeeque

Re: pix of Custom built guitar amps/cabs
« Reply #857 on: October 04, 2019, 03:30:39 AM »
hi T.

yes please, i'll have a go at it...

 I started new topic: /smfforum/index.php?topic=123179.0 ✌️
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Marcos - Munky

Re: pix of Custom built guitar amps/cabs
« Reply #858 on: December 02, 2019, 08:29:43 PM »
This is a EF184 tube preamp + a TDA8932 class D amp board.


I used a laptop power supply (19V) to power the whole thing. The TDA board is powered by the laptop power supply. Then I used a dc-dc step down converter to lower it to 6V to power both the heater and a 555 smps for the high voltage (which I forgot if it was 150V or 250V, probably 150).

rankot

Re: pix of Custom built guitar amps/cabs
« Reply #859 on: December 03, 2019, 03:49:51 AM »
Great, Marcos! I'm just in the process of deciding how to power my new mic pre, and I thought I could do SMPS, too! I've got some Chinese DC-DC converters for cheap, so I will experiment with them. My idea is to go 12V (for heaters) and then boost that to 220-250V for B+. What's your experience with this - is it noisy or not?
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