Tube Rectified SLO-18

[AnalogDok]

I've completed my first preliminary drawing of a mash up of a Marshall 18 watt power section and a SLO.

Hopefully everything looks correct. Please take a look and let me know if I missed anything or screwed it up.
Any help will be greatly appreciated. I haven't seen this hybrid version done before (probably for a good reason).

Thanks in advance

[Latole]

I can't open your file.
I'm I the only one ?

[d95err]

Please convert the file to a pdf and post it.

[sluckey]

.

[pdf64]

Thanks sluckey!
Unfortunately that is a layout, ie how the circuit will be implemented.
To review / analyse the circuit itself, a schematic is necessary.

[Latole]

On only work from schematic first
Look why from you layout ; EL84 pins number are are poorly or not identified

[sluckey]

Speaker jacks wired wrong. Should use correct tube socket for EL84s. Take the time to connect wires properly rather than just close. Hopefully rev.2 will look better. My drawings usually go through many revisions before I put on the net.   

[AnalogDok]

LOL....Ver 1.0 is the first Version I've publically posted.
I've been working on this and revising it for 4 months. It is V1.0 because it would be V200.106.400 if I updated the version # for every change.
I had a choice or octal or 9 pin in DIYLC...I can't seen to find what I want like the sockets and switches, trim pots etc.

[AnalogDok]

OK, I changed the tube sockets. For some reason, they aren't in my pick list.
Corrected the speaker out and reconnected all those unconnected wires. I had to try and do a move of a lot of the board and it got pretty messy. I corrected everything I saw.

[Bieworm]

You used the coupling caps with the foil side markings. If you intend to put the foil sides per your layout , they're practically all orientated the wrong way. It's always better to orientate them with the foil side at the end where DC can sneak into your circuit. That's usually your ground reference point or a pot. And if you really want to determine the foil side of the caps, you need a scope. It's pretty easy. And trust me, the stripe on most caps are usually there for aestetics and no guarantee for being placed on the correct side. IIRC Sozo caps are correct, but most other brands aren't.

[AnalogDok]

Bieworm,

That was interesting. My old HP 465 has a blinking CRT so this was a good test of my new Siglent SDS 1202X-E.
It took a while to set it up to show the amplitude changes but it was very eye opening. The Orange Drops that I have kitted up for this build were random as to the foil side and the printing on them. I use Sozo on my Marshall type builds but have been using OD's on my Supro and Fender builds. You can really see the active antenna side and the quiet side while testing. It was a good excuse to calibrate my scope and the new 200mhz Hantec probes I bought. The Siglent ones are delicate and I broke one already. It happens when you have no feeling and very little muscle control over your dominate hand. There isn't any glassware, china, crockery or anything breakable left in the house.

I know none of the amp Mfg's ever did any foil side testing but on a SLO preamp, I'm willing to go to extremes to get it quiet.

Thank you for the tip. It was a great learning experience and I'll go look and fix my layout.
I would do a schematic but I have very limited use of my right hand so trying to do any fine mouse work with the left hand is very difficult. Just the layout in DIYLC is very tough and the failed multiple carpal tunnel surgeries on both wrists and elbows aren't making it any easier. Adapt and overcome.

[AnalogDok]

Lots of changes and corrections to the layout.

[Bieworm]

Lots of changes and corrections to the layout.

It's not arbitrary for easy builds, but it's just more fun. I don't think those caps are the source of a lot of noise in lower gain amps.

[sluckey]

Speaker jacks still wired wrong. Blue wire should connect to tip, not sleeve. EL84 sockets wired wrong. Brown wire should go to pins 9, not pins 1. I didn't look at anything else since there's no schematic.

[AnalogDok]

Thank you Sluckey.

Corrected.
I was looking at the EZ81 when I wired the El84...

I'll try creating a schematic. Slow and painful.

[Bieworm]

Steve's right. You must provide us with a schematic. There is a lot of stuff going on in there that's very questionable. What is that switch thing on the output jack? Grounding looks like trouble too.

[AnalogDok]

Bieworm,

A schematic will take time. I'm one handed and it barely functions.
Patience.

[Latole]

Bieworm,

A schematic will take time. I'm one handed and it barely functions.
Patience.

Courage,
A philosopher once said that things that are really worthwhile require effort.

[AnalogDok]

I'm missing a 16uF cap but the board is done otherwise. I thought I had more in stock...Oh Well...
I pulled off the old black tolex and did snakeskin.

Priorities....

I had to stop using the PC for a while. I did the layout for a AB763 and ordered the parts until 3:00AM last night.
I used my hands and time to do what I wanted to do today.
The mouse gives me hellish hand cramps and pain that keeps me awake.

[AnalogDok]

Board Mounted.

[Latole]

The wires between the circuit and the tubes sockets won't be a problem? Some sockets seem to be hidden under the circuit or am I wrong?

[AnalogDok]

It is what it is...Adapt and overcome.

[Bash]

To me it looks like you are trying to connect the preamp part of the SLO-Naked to the power sections (including rectifier) part of an AC-18.
Is this correct?

The preamp part is identical to the SLO-Naked layout, so I am assuming that part is correct.

The power-part still looks off...
As Sluckey mentioned the connection to the output ground is wrong (see attached ttac18-layout for correct connection).
Compared to that layout the connection to the power tubes is different (connected to 1 instead of 6, but I don't know whether these are interchangeable) and the layout for the standby switch is also slightly different.


Your cabinet and soldering work look great.
I am really interested in how this will turn out sound-wise.

[pdf64]

… preamp part of the SLO-Naked …

The DCCF in that seems to have been messed up?
By taking the tone stack output from a split load cathode resistor, its output impedance has been changed from less than 1k to over 17k (ie about 22k//82k).