Boothill 5e3 kit. First time build

Discussion in 'Shock Brother's DIY Amps' started by TuneHead, Aug 1, 2019.

  1. TuneHead

    TuneHead TDPRI Member

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    I've just about got all my parts together now. Base kit from Dave at Boothill amps. Hammond 290BEX power transformer (i'm 240v).

    NOS tubes:- HYVAC 12AX7 and GE 5Y3GT from Dave, 2 matched GE 6V6GTA's and a GE 12AY7 from some local suppliers.

    I've ordered a 12A125A speaker from Ted Weber and will build a pine box myself.
     

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  2. Cantbreak100guy

    Cantbreak100guy Tele-Meister

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    Have fun!!!
     
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  3. TuneHead

    TuneHead TDPRI Member

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    Ok. So lots achieved today. I've attached a image of my populated turret board. If someone would be so kind to give it the once over, before I trim the leads and solder.
     

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  4. corliss1

    corliss1 Friend of Leo's Platinum Supporter

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    I always put the power tube cathode resistor on the outside to give it more space around the capacitors. It'll get hot and eventually "cook" those caps.
     
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  5. D'tar

    D'tar Friend of Leo's

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    Yep^^^^
     
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  6. TuneHead

    TuneHead TDPRI Member

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    Great advice thank you. I’ll swap it over.
     
  7. TuneHead

    TuneHead TDPRI Member

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    inputJacks wired.JPG Today I started to wire up the signal side of the amp. I wired up the 1M resistors on the jacks and soldered. Mistake number 2. (I needed to add some additional signal wiring before soldering). Trying to test my work, I can't figure out what is going on. I seem to be getting two differing result on each of the input no 1 jacks. When I test the left hand (in the picture) jack (bright 1) I get a short circuit across ground and the T terminal regardless of whether a cable is plugged in. When I test the right hand jack (Normal 1) I get a short across the ground and the T, until I plug a cable in and then get 1M showing. Which is what I was expecting.

    Upon closer inspection of my soldering I can see that some solder had bridged a connection on the side of the jack. Is this my issue? When I test the other jack across this part, they seem to be connected in any case. It's doing my head it....

    inputjack 1.JPG
     
  8. TuneHead

    TuneHead TDPRI Member

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    Ok. So I unsoldered the offending jack and have replaced it with the one from the speaker position. Wired that up and everything tests as I expected. I'm even more confused now. Can anyone shed some light on what might have gone wrong? Thanks.
     
  9. D'tar

    D'tar Friend of Leo's

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    You're good. You shorted the tip to the shunt which is grounded. Just superheat it with solder iron and hit with a solder sucker or carefully tap it on the workbench when hot to remove the bridge.

    Gravity!!
     
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  10. TuneHead

    TuneHead TDPRI Member

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    Yeah... Skilled that's what I am, some might say "gifted".
     
  11. TuneHead

    TuneHead TDPRI Member

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    Well I've wrapped up the day with a test of the PT system. I'm getting good ground on the chassis, and good voltages from the secondary circuits. 6.3v across the greens, 5v across the yellows and 342v and -342v on reds to red/yellow.

    Confidence is much higher now than it was earlier in the day when I have having a shunt of a time. I might actually get this thing up and running, (with a lot of help from my new friends. *thanks)

    Tomorrow I'll wire up the heaters I think and test that circuit.

    This post from King Fan is particularly helpful. https://www.tdpri.com/threads/and-away-we-go-another-5f2-a-first-amp-build.964812/#post-9223120

    Thanks to everyone on this forum. There's so much great info available.
     
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  12. Robear

    Robear TDPRI Member Ad Free Member

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    That was a particularly helpful post. I’m very glad King Fan shared that. It helped me get mine up and running today. Along with D’tar, who seems to be out and about dispensing free advice and help to all who require tonight!
     
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  13. D'tar

    D'tar Friend of Leo's

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    Lol! I have the smoker going this weekend! Lots of free(me)time in the barn.:) Guitars, amps, food and drink!
     
  14. Robear

    Robear TDPRI Member Ad Free Member

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    Had the smoker going? Now I really wish I was in WNY and I’d let you buy ME lunch. :D
     
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  15. TuneHead

    TuneHead TDPRI Member

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    Mmmmm smoked goodness...

    In an attempt not to create my own smoke with this amp. Please would someone check I've got these heater wires hooked up correctly? That's not a job I want to re do if I can avoid it.

    Thank you.
     

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  16. corliss1

    corliss1 Friend of Leo's Platinum Supporter

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    Heater wires for me are the lamest part of any build. Make sure you leave yourself enough room so you can get to the rest of the pins.
     
  17. TuneHead

    TuneHead TDPRI Member

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    Thanks corliss1. I'll wire up the rest of the sockets before I solder anything. But yeah, I agree not a "fun" part of the build.
     
  18. TuneHead

    TuneHead TDPRI Member

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    Oh my oh my.

    The sweet sound of a tube amp. Now i get what all the fuss is about.

    I first had to un-solder and re arrange the input jacks as they didn't clear the turrets once the board was in the chassis. So that took me a while. In the process I discovered a couple of broken wires, so that was a good bit of trouble shooting.


    I walked through the amp power up phases as per the link from King Fan above, and cross checked it with Rob's power up procedure. Including stepping though the schematic and ticking off each connection once verified for continuity.

    Everything was checking out ok.

    So full phase power on without the lamp limiter. Guitar in and volume up with lots of hum. Unplug, drain caps and check lead dressing. I moved couple of signal wires, and tried again....

    Silence. Volume up.... silence and then hiss as the volume increased.

    All inputs checked out ok. Volume and tone pots appear to be working. Man is this thing loud. I ordered a 30w speaker by mistake so I guess it doesn't really break up as early as it should. I'm, getting pretty clean tones all the way up to about 9 on the volume pots.

    Anyway lots still to learn about this thing. I've still got the cabinet to build but I am super stoked that it works, is quiet and cranks out some awesome sound. Actually, I'm just super stoked it works.

    Voltages seem to be a little on the high side.

    B+ 374
    B+2 336
    B+3 248

    V1 pin1 119
    pin3 2.1
    pin6 119
    pin8 2.1

    V2 pin1 171
    pin3 1.1
    pin6 206
    pin8 41.7

    V3 pin3 365
    pin4 336
    pin8 20.4

    V4 pin3 365
    pin4 336
    pin8 20.4
     
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  19. D'tar

    D'tar Friend of Leo's

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    Sweet Sweet Tube Tone!!!! Congrats!!! Those numbers loook pretty good to me.
     
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  20. Diverted

    Diverted Tele-Meister

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    Yeah, those numbers are solid like D-Tar said, right around where they should be. Congratulations!
     
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