Another Small Special build with a twist

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Synchu
Posts: 522
Joined: Sun Mar 11, 2012 5:24 am

Re: Another Small Special build with a twist

Post by Synchu »

English is fine (me being non native speaker and even worse writer ;) )!

Haven't tried that yet and I (would) concur that it doesn't do anything in a sense of NFB (but I think it still works as an output filter). However, I don't yet have the knowledge to confirm neither.

Anyway, I hope to have some time today evening to experiment more thoroughly.

Whatsoever amp sounds great to my ears and whatever mod I would do I will make sure it is switchable, so I can always go back and forth in a flip of a switch.
Synchu
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Re: Another Small Special build with a twist

Post by Synchu »

Alrighty - stupid mistake - flipped OT primaries and was creating positive feedback :)
Now works as expected - with current values of the resistors it is much quieter than without the NFB and frequency response, naturally, is different.
I wired it on a switch since it sounds great without the NFB as well.
I might play with the resistors (i.e. put a larger one) to decrease the volume loss and since I have few rotary switches around may wire few different capacitors to play with the frequencies.

Updated layout and thanks EaNot :) Made me read and learn some more. Great forum this is.
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telentubes
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Re: Another Small Special build with a twist

Post by telentubes »

I have a Watts 17 1/2" chassis that I will try to stuff it in to. Might consider reverb and an effects loop as well. As with all my builds, it will take a while. Thanks again for the layout.
EaNot
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Re: Another Small Special build with a twist

Post by EaNot »

Synchu wrote: I wired it on a switch since it sounds great without the NFB as well.
Yes, it's a cool option, I used it too.

PS: Slav brother? ;)
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jelle
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Re: Another Small Special build with a twist

Post by jelle »

Nice job!! :D
RockNRollDr
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Re: Another Small Special build with a twist

Post by RockNRollDr »

Any ideas for adding reverb to this circuit?
PaisleyTube
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Re: Another Small Special build with a twist

Post by PaisleyTube »

RockNRollDr wrote:Any ideas for adding reverb to this circuit?
see SSS or ODR sn.60
Chris
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groovtubin
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Re: Another Small Special build with a twist

Post by groovtubin »

Synchu wrote:Good point. Will try shooting something more appropriate tonight.
It is hard to resist what all this phone apps suggest :)
AWESOME ACOUSTIC MELODY MATE!!

im@Omegaamps
telentubes
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Re: Another Small Special build with a twist

Post by telentubes »

Got my PT, OT, and choke today. I think I will use the 15 1/2" chassis instead of the 17 1/2". Looks like everything will fit without any problem.
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mhartman
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Re: Another Small Special build with a twist

Post by mhartman »

RockNRollDr wrote:Any ideas for adding reverb to this circuit?
Just tack on a 1-tube reverb. There are some schems in the file section.
Synchu
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Re: Another Small Special build with a twist

Post by Synchu »

groovtubin wrote:
Synchu wrote:Good point. Will try shooting something more appropriate tonight.
It is hard to resist what all this phone apps suggest :)
AWESOME ACOUSTIC MELODY MATE!!

im@Omegaamps
Thanks :)

As for reverb, I was thinking of adding an FX loop and using the digital ones, which to my current experience, I find a bit more consistent.
However, in my next (planned) build I will do a tube one and will decide. It is a relatively easy mod.

15 and 1/2" chassis should be fine depending on the PT. Mine is quite large through hole lay down (on the wider side) type and would have been very tight in a smaller chassis.
telentubes
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Re: Another Small Special build with a twist

Post by telentubes »

Small Special, ala Synchu, started. I went with a 2.5" X 8" X 16" chassis. A bit of a bummer cuz now I have to build another cab (I have a combo cab that the 15" chassis fits in).
This is my first return to MC iron. I thought it was kind of light duty when I bought a set a year or two ago, but I see so many folks use, and like them, that I thought I'd try again. The price is also attractive. Dirty Dawg chassis.

Should I start another thread, or is it OK to camp out on Synchu's?
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dcribbs1412
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Re: Another Small Special build with a twist

Post by dcribbs1412 »

Looking good telentubes
I have this same iron and thinking of doing this amp.
looking forward to your progress.

Thanks
Darin
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jelle
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Re: Another Small Special build with a twist

Post by jelle »

Great transformers. They work well.
Synchu
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Re: Another Small Special build with a twist

Post by Synchu »

Looking excellent!

Here in Europe getting a different iron than Hammond is almost impossible (at least very expensive with shipping costs and import duties/VAT).
Or at least I don't know of any ClassicTone, Heyboer or Edcor distributors. Sowters are almost out of question price wise.

Otherwise, I think this topic is more than capable to host more than one build :)

Niki
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