My fuse burned out during assembly, only later I found out that it was of a low rating. But overall there were no problems with the assembly, everything worked right away. I used homemade optocouplers - a white LED and a photoresistor, the shadow resistance was about 20 MOhm, and the illuminated resistance was 100-120 Ohm. Good luck with the build!
Ohhh, home made LDR, I've never considered that. There have been times I've looked for those parts but had a hard time finding them. I def did something wrong in this build, the problem was my fault.
Looks like it arc’ed from the fuse holder to the star ground near there, and from somewhere near the bias test point, or between the 220k grid leaks after the phase inverter to each other, or the chassis. I’m intrigued for the follow up video on why it was sparking like that. Did you connect pin 1 and 8 together for the el34’s? (I know for a fact they’ll run without the suppressor grid connected, but it can cause issues). Maybe the test load died causing a short across the OT?
Hah, when the fuse blew the light from the spark was seen thru the holes the contacts pass thru. It's hard to see on the first angle but a preamp tube shorted out, and there is a spark there to. This video was filmed a while ago, so I know what happens next, and it was a dumb mistake I made wiring the preamp tubes sockets.
@@DATT Ah, that’s very easily done. Next build I do, I’m actually gonna stick the 9 pin sockets in a little soft jaw vice and pre wire colour coded leads to them (everything except the heaters). I find wiring them up in the corner of a chassis insanely fiddly. (Wouldn’t really work with the design of these SLO clone boards, but with turrets, or boards with a strain relief hole like Marshall’s it’ll be fine)
@@DATT Can you break the glass or otherwise remove the glass on the shorted preamp tube and solder equivalent resistors to each of the pins that way the meter should show the correct currents and voltages proving the wiring? Could be done for all of the amp tubes though where to find that many broken ones? Also theres current limiting on bench power supplies :) As a matter of fact if one amp tube can fit all of the slots then you can use the test amp for each of them and as long as you got resonable currents/ voltages g2g. then test fully assembled for required voltages and currents.
@@Jonathan_Doe_ Yeah, kind of had to wire the board first in the SLO. My wiring was good for the most part, it was a bad resistor placement, which was done earlier.
Off the top of my head I'd almost say no. The JET is so close to the SLO you don't even really need to mod it to get that sound. The JET is super easy to work on, and implement those mods. If you want a good sound on a budget, I'd go JET. This build would be more of a "because I can project" for an enthusiast who can afford it and want's the SLO aesthetic. I have a modded JET, and after doing this project, I have no desire to own an SLO.
@@HandWiredAmps Oh boy, I guess this would be one of my first real cliffhangars. The timing worked out in editing. Sometimes I'm not sure how these videos will flow till I'm actually cutting them.
I commend you for making and posting your videos. I often want to post different things, mostly educational, but I know what goes into it and I have enough hobbies already. @@DATT
@@HandWiredAmps Yeah, def adds work to a project. Not sure I intend them to be education are much as anecdotal. I'm not sure I consider myself qualified to educate. Lots of my vids are my figuring it out as I go along.
If I recall correctly, editing the next vid will jog my memory, that was a preamp sure shorting internally cause I wired the sockets wrong. Basically I made a dumb mistake.
Oh yeah I did. If you notice I put a date at the beginning of each video right after the intro, so people can follow the timeline of my videos. My channel lacks linearity. This project was maybe 2 years ago. The amp was finished and delivered. This was the most recent video post, There are a few more episodes left to edit and publish. I release and Ep a month.
At 28:41 You can see the spark toward the middle of the main board in the back. I really enjoy watching these videos.
Yeah, hah. It's one vid I kind of kept my mistake.
Looking forward the next video. Troubleshooting is always most interesting part of these videos.
Hilarity ensues.
My fuse burned out during assembly, only later I found out that it was of a low rating. But overall there were no problems with the assembly, everything worked right away. I used homemade optocouplers - a white LED and a photoresistor, the shadow resistance was about 20 MOhm, and the illuminated resistance was 100-120 Ohm. Good luck with the build!
Ohhh, home made LDR, I've never considered that. There have been times I've looked for those parts but had a hard time finding them.
I def did something wrong in this build, the problem was my fault.
Looks like it arc’ed from the fuse holder to the star ground near there, and from somewhere near the bias test point, or between the 220k grid leaks after the phase inverter to each other, or the chassis.
I’m intrigued for the follow up video on why it was sparking like that.
Did you connect pin 1 and 8 together for the el34’s? (I know for a fact they’ll run without the suppressor grid connected, but it can cause issues).
Maybe the test load died causing a short across the OT?
28:42
Hah, when the fuse blew the light from the spark was seen thru the holes the contacts pass thru. It's hard to see on the first angle but a preamp tube shorted out, and there is a spark there to. This video was filmed a while ago, so I know what happens next, and it was a dumb mistake I made wiring the preamp tubes sockets.
@@DATT Ah, that’s very easily done. Next build I do, I’m actually gonna stick the 9 pin sockets in a little soft jaw vice and pre wire colour coded leads to them (everything except the heaters). I find wiring them up in the corner of a chassis insanely fiddly.
(Wouldn’t really work with the design of these SLO clone boards, but with turrets, or boards with a strain relief hole like Marshall’s it’ll be fine)
@@DATT Can you break the glass or otherwise remove the glass on the shorted preamp tube and solder equivalent resistors to each of the pins that way the meter should show the correct currents and voltages proving the wiring? Could be done for all of the amp tubes though where to find that many broken ones? Also theres current limiting on bench power supplies :) As a matter of fact if one amp tube can fit all of the slots then you can use the test amp for each of them and as long as you got resonable currents/ voltages g2g. then test fully assembled for required voltages and currents.
@@Jonathan_Doe_ Yeah, kind of had to wire the board first in the SLO.
My wiring was good for the most part, it was a bad resistor placement, which was done earlier.
cool build dude 👌 How will it sound on comparison to a moded JetCity 100/50? Wouldbe really interesting to hear.
Yes me too, looking forward to find out if that build is worth it compared to a Jet City modded
I prefer the sound of MY modded Jet City. And in fact, if I has an SLO I would mod it from stock.
Off the top of my head I'd almost say no. The JET is so close to the SLO you don't even really need to mod it to get that sound. The JET is super easy to work on, and implement those mods. If you want a good sound on a budget, I'd go JET. This build would be more of a "because I can project" for an enthusiast who can afford it and want's the SLO aesthetic. I have a modded JET, and after doing this project, I have no desire to own an SLO.
@@DATT great to know! Thanks
@@PhuketMyMac Yw !
Light bulb limiter. Sometimes I forget mine and sometimes I get lucky. Really should have it permanently in the bench AC supply. My next project.
Oh yeah, I use one of those. In this cause it wouldn't of been applicable as the PSU circuit was fine.
The suspense is killing me. LOL Waiting for the next video! @@DATT
@@HandWiredAmps Oh boy, I guess this would be one of my first real cliffhangars.
The timing worked out in editing. Sometimes I'm not sure how these videos will flow till I'm actually cutting them.
I commend you for making and posting your videos. I often want to post different things, mostly educational, but I know what goes into it and I have enough hobbies already. @@DATT
@@HandWiredAmps Yeah, def adds work to a project. Not sure I intend them to be education are much as anecdotal. I'm not sure I consider myself qualified to educate. Lots of my vids are my figuring it out as I go along.
Did you have arcing to the ground bias testing point?
If I recall correctly, editing the next vid will jog my memory, that was a preamp sure shorting internally cause I wired the sockets wrong.
Basically I made a dumb mistake.
Did you end up finding the issue and completing this? I didnt see a video after this playing it through?
Oh yeah I did. If you notice I put a date at the beginning of each video right after the intro, so people can follow the timeline of my videos. My channel lacks linearity. This project was maybe 2 years ago. The amp was finished and delivered. This was the most recent video post, There are a few more episodes left to edit and publish. I release and Ep a month.
Ты крутой
Спасибо