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PostPosted: Thu, Jun 06, 2019 2:19am 
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I dont wanted to litter FourT6and2 topic further, so i am creating new one, dedicated strictly to my build. After succesful run and some tweaks i will upload schema of this project and some video samples.

Okay so main arrangements:
- 50W
- tube fx loop
- 1 gain knob
- clipping style selector
- master volume after tone stack and fx loop
- rather brown voltages
- AC heated tubes + maybe elevation to DC
- one channel
- mustards

Current progress:

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PostPosted: Thu, Jun 06, 2019 3:54pm 
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Nice.

What's up with the 4th tube socket? You doing an extra gain stage? Ideally you want V1 to be the very last in line for the heater string. Right now you've got that tube piggybacking off V1.

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PostPosted: Thu, Jun 06, 2019 4:07pm 
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Thanks!

Fourth tube is for buffering and recovery stage of fx loop. About heating chain - good point, im a bit aware of it too. If it will cause some problems with hum i will rearrange it, and maybe elevate to DC.

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PostPosted: Fri, Jun 07, 2019 1:10pm 
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Okay, your suggestion forced me to rethink this arrangement, and I decided to fix it right now - cause later it will be extermely hard to modify in the jungle of other wires.

Meanwhile i progressed a bit too.

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PostPosted: Sun, Jun 09, 2019 5:41am 
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Subscribing.

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Mesa:, mkIV, Tremoverb, Nomad 100, Subway Blues, .22 cal w/GEQ.
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PostPosted: Sun, Jun 09, 2019 7:12am 
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Thanks!

New progress: clipping selector, bright cap wiring, main ground rail, started filling board.

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PostPosted: Mon, Jun 10, 2019 9:44am 
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Hmmm... if it were me, I'd probably go from the PI to that other socket and then from the PI to the CF instead of running two heater chains under the preamp board. But it might work out ok the way you have it. Fingers crossed :)

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PostPosted: Mon, Jun 10, 2019 10:00am 
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But this is actually just as you said:) There is one heating chain from power tubes to PI and then to this extra socket, and from extra socket to the rest of preamp. Second line is wired only for indicator. Cheers!


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PostPosted: Mon, Jun 10, 2019 10:11am 
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Hah, now i see you meant different arrangement, hope this will work just fine! Preamp board is pretty high, and heating wires are passing just under preamp filtering section (100uF) of board :thumbsup:


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PostPosted: Wed, Jun 12, 2019 1:57pm 
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FourT6and2 wrote:
Hmmm... if it were me, I'd probably go from the PI to that other socket and then from the PI to the CF instead of running two heater chains under the preamp board. But it might work out ok the way you have it. Fingers crossed :)


Agreed. No need to run a set of wires back, just go from the PI tube to the loop and V2.

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PostPosted: Thu, Jun 13, 2019 6:10am 
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Yestarday was an amp day, so there is a progress: Main F&T filter caps, further board filling, some minor updates etc. It is finally starting to look like an amp :rock:

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PostPosted: Thu, Jun 13, 2019 7:00pm 
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Woohoo! Love it!
How have you mounted those octal tube sockets?

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PostPosted: Fri, Jun 14, 2019 3:30am 
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Hi, thanks!

I used just a classic bolts with ~4mm pads (two stacked nuts actually, but im planning to change by real pad) , to raise them a bit :)

Cheers!


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PostPosted: Sat, Jun 15, 2019 9:31pm 
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Why not mount them on the underside of the chassis?

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PostPosted: Tue, Jun 18, 2019 3:27pm 
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V2a - i wanted to sav some space inside chassis, what's more - holes were to small.

Okay next episode - i had some troblems with Power Transformer - manufacturer swapped accidentally 0V and 60V taps, and i was grounding 60V. Voltage on main filter was 515V on standby, so I decided to decrease it by 51V by simple MOSFET/zener circuit called 'B+ reducer'. Now i have about 465V on standby, which is nice!

So, to sum it up - Power supply is almost finished, main filter is working good, bias supply too (-35V to -65V). I've also moved a bit heating line so now it is passing just under 80uF preamp cap.

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PostPosted: Tue, Jun 18, 2019 3:42pm 
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Looks awful neat in there! Can't wait to hear it :rock:


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PostPosted: Wed, Jun 19, 2019 3:02am 
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Thanks, me too! Althrough i didn't thought that this chassis will be so small - it is so hard to organize it! Ceriatone ones are bigger and better.


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PostPosted: Wed, Jun 26, 2019 2:12am 
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Further progress, waiting for last lacking capacitors and resistors, also changing choke from soldano like 10H to 4H. Today higher quality photo ! :yes:

https://i.imgur.com/lvdPqln.jpg


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PostPosted: Wed, Jun 26, 2019 6:54am 
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Nice work!

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Splawn: PROMOD KT88, Nitro KT88, Super Sport 6V6.
Orange Rockerverb 50mki. Fryette Sig:X. Rivera K100.
Mesa:, mkIV, Tremoverb, Nomad 100, Subway Blues, .22 cal w/GEQ.
Krank Rev+. Peavey JSX
Musicman 100RD.
Fender: 72 SF Bassman, 70 Twin Reverb, 67 SF Bandmaster.
Ampeg: Lee Jackson, AX70, Crate BV120 w/CEC mods.
BUILDS: 5F1, 1978X 18 Watt.
BUILDS IN PROCESS: AA165, JTM45.
And a bunch of modded EPI VJR's.
42 guitars and countless pedals.


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PostPosted: Sat, Jul 06, 2019 1:41pm 
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Okay guys i did it, sounds huge, bit more aggresive and open than my XTC clone. I didnt have el34 tubes, so i ran it exceptionally on 6l6GC Mesa tubes. I was bit afraid about noise due to the unusual heaters wiring pattern but it is super quiet.

Unfortunately it also turned out that my PT is too weak for this configutarion, and after ~1h of playing it is getting hot, I didnt measured temperature, but i can hold my finger (even making some pressure) on it for 10 or more seconds. I am afraid that in el34 situation it will be even worse. Maybe i will buy InMadOut Plexi 50W replacement trannie.

PSU voltages:
6l6GC Plates: 440V
6l6GC grids: 439V
PI: 320V
Fx loop: 305V
Preamp 1: 282V
Preamp 2: 270V
Bias: 40mA

Guts and samples:

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PostPosted: Sat, Jul 06, 2019 4:18pm 
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Nice!

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PostPosted: Sat, Jul 06, 2019 4:38pm 
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Very nice indeed. Clean work!

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Splawn: PROMOD KT88, Nitro KT88, Super Sport 6V6.
Orange Rockerverb 50mki. Fryette Sig:X. Rivera K100.
Mesa:, mkIV, Tremoverb, Nomad 100, Subway Blues, .22 cal w/GEQ.
Krank Rev+. Peavey JSX
Musicman 100RD.
Fender: 72 SF Bassman, 70 Twin Reverb, 67 SF Bandmaster.
Ampeg: Lee Jackson, AX70, Crate BV120 w/CEC mods.
BUILDS: 5F1, 1978X 18 Watt.
BUILDS IN PROCESS: AA165, JTM45.
And a bunch of modded EPI VJR's.
42 guitars and countless pedals.


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PostPosted: Sun, Jul 07, 2019 3:58am 
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Thanks guys! I am really happy, cause it has very different character than my xtc copy - more open, aggresive, riffs are super tight! XTC is more melodic, compressed, bit muddier (but in the way that i absolutely love).

The only problem is this transformer, or maybe i am overreacting a bit. It is definately getting hot after ~1h of playing. I can grab it and hold even for >10sec, of course it is not pleasant but it definately cannot burn my skin. I also noticed that it does not depend on load - with all preamp tubes pulled off it is still getting hot.


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PostPosted: Tue, Jul 09, 2019 11:57am 
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Your build sounds very cool!


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PostPosted: Wed, Jul 10, 2019 6:28am 
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Recon wrote:
Thanks guys! I am really happy, cause it has very different character than my xtc copy - more open, aggresive, riffs are super tight! XTC is more melodic, compressed, bit muddier (but in the way that i absolutely love).

The only problem is this transformer, or maybe i am overreacting a bit. It is definately getting hot after ~1h of playing. I can grab it and hold even for >10sec, of course it is not pleasant but it definately cannot burn my skin. I also noticed that it does not depend on load - with all preamp tubes pulled off it is still getting hot.


What brand teansformer did you use?

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Splawn: PROMOD KT88, Nitro KT88, Super Sport 6V6.
Orange Rockerverb 50mki. Fryette Sig:X. Rivera K100.
Mesa:, mkIV, Tremoverb, Nomad 100, Subway Blues, .22 cal w/GEQ.
Krank Rev+. Peavey JSX
Musicman 100RD.
Fender: 72 SF Bassman, 70 Twin Reverb, 67 SF Bandmaster.
Ampeg: Lee Jackson, AX70, Crate BV120 w/CEC mods.
BUILDS: 5F1, 1978X 18 Watt.
BUILDS IN PROCESS: AA165, JTM45.
And a bunch of modded EPI VJR's.
42 guitars and countless pedals.


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PostPosted: Thu, Jul 11, 2019 8:35am 
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It is just a 5yo transformer ordered according to my specifications in small local manufacturer. I already ordered another, much better one in much better firm ;)

Recently, I also tweaked a bit preamp section and tested some other clipping options:

- MPSA06 with additional 2.2k resistor in series to ground - for me too aggresive, but i guess for metal its totally awesome :)
- 14V zener - too aggresive - a lot of large grain which i hate (like with 10V zeners)
- 27V ! - love it, classic hot rodded rock tone with a bit of saturation, easy to boost for more liquid lead sound, definately will keep it as one of 3 options.

Maybe i will try also something like 30-33V zeners, cause direction is obviously right!

Current clipping setup: None/27V/20V


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PostPosted: Thu, Jul 11, 2019 6:48pm 
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Recon wrote:
It is just a 5yo transformer ordered according to my specifications in small local manufacturer. I already ordered another, much better one in much better firm ;)

Recently, I also tweaked a bit preamp section and tested some other clipping options:

- MPSA06 with additional 2.2k resistor in series to ground - for me too aggresive, but i guess for metal its totally awesome :)
- 14V zener - too aggresive - a lot of large grain which i hate (like with 10V zeners)
- 27V ! - love it, classic hot rodded rock tone with a bit of saturation, easy to boost for more liquid lead sound, definately will keep it as one of 3 options.

Maybe i will try also something like 30-33V zeners, cause direction is obviously right!

Current clipping setup: None/27V/20V


Anything higher than that and you might as well not bother. In my builds 24v is too high. You can get to the same place just by turning up the gain. I think 18v is the sweet spot for all-around clipping. And then MPSA06 for modern sounds.

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PostPosted: Fri, Jul 12, 2019 2:13am 
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Thanks for precious advices!

I agree with MPSA06 for modern sounds - i have very similar feeling.

When it comes to my 27V - volume sag is definitely noticeable, also character of distortion is different (than without clipping). Maybe it depends on preamp and MV configuration more than i was suspecting. Untill now, I really like 27V diode, but 20V is very interesting too.

I will write here schema, but i must find some spare time ;) I am also planning to record some more samples, maybe louder, with better quality.


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