trainwreck build by karczochrulez in a mcgyver style :)

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rooster
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Re: trainwreck build by karczochrulez in a mcgyver style :)

Post by rooster »

OMG!!!! :D I am totally stunned by what you have done here!! I will think about this often in the days ahead, karczochrulez.

I, too, have done some pretty off the wall things in my day but nothing like this. I applaud you, your amp building skills, and, above all, your ability to make your way to the end of the rainbow - in spite of some huge obstructions. Looking at the many pics of your amp makes me want to laugh with joy - for you, yes, but also for everyone on the planet. You are a lesson to us all and I wish you a long and happy life, my Brother. By all means, play that frickin' guitar!!!! 8)
Most people stall out when fixing a mistake that they've made. Why?
Jana
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Re: trainwreck build by karczochrulez in a mcgyver style :)

Post by Jana »

+1 what rooster said!
karczochrulez
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Re: trainwreck build by karczochrulez in a mcgyver style :)

Post by karczochrulez »

rooster,
I was deeply moved by your post. What am I say? Thanks Brother!
This motivate me to next TW projects. (yesterday I bid next PT as OT transformer :)
Now you know my philosophy - a different wiew to ordinary things. :)

I rest in sunday and wisited my mother - only one pic below :lol:
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breakfastbuddy
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becouse primary is 2x115V and secondary is for example 2x9V

Post by breakfastbuddy »

can that be done with any transformer that have the prim 120+120 volt ?
and how is that winding compared to a ot that meant as a ot ?
do you find how big the wattage is and then see whats the sec prim impedance is ? and just adjust the missmatch so it lines up with the right impedanse compared to the B+ ?
:wink:
breakfastbuddy
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other ot substitutes

Post by breakfastbuddy »

have you tried to use a microwave transformer as a OT ? what is your experience ?
Espen from Norway
karczochrulez
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Re: trainwreck build by karczochrulez in a mcgyver style :)

Post by karczochrulez »

breakfastbuddy Ill try to answer
This solution is simple only on first wiew
For me it was simple, becouse this kind of tranny series ZATRA TS50 are well known as good to use as OT. I calculate a primary impedance and choose one of this.
First you must know how many turns your tranny have a primary. Than you must know is enough or not. My tranny have more/less 1300 turns. and watteage 50W.
Next is voltage gear and calculate primary impedance
usually if tranny is stronger primary turns going down. I think a microvave tranny is probably much more than 50W (500W or more I think)
PS today I do nothing ;( but I bought a glue, wires and hand tap 3mm :)
karczochrulez
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Re: trainwreck build by karczochrulez in a mcgyver style :)

Post by karczochrulez »

I hadnt time on this week but amp working again :) Woodworking and V1, 2pin to vol wire is shield wire replaced

I have a question: wood front pannel will be gluing to brass or not? :roll:
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rooster
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Re: trainwreck build by karczochrulez in a mcgyver style :)

Post by rooster »

Hi. Some of my faceplates are thin so I glued them on with contact cement. I figure the faceplate is going to stay with the particular amp so why not glue it on? I do have one that is thicker however that I have not glued on. The thing about wood is is doesn't really vibrate like metal will so it should be OK to just put it on with the nuts and washers from the pots and switches. The one that is not glued is working out fine so I think this is your call.

A good question is whether or not Ken Fisher glued his faceplates on. Can anybody comment on this?
Most people stall out when fixing a mistake that they've made. Why?
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rooster
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Re: trainwreck build by karczochrulez in a mcgyver style :)

Post by rooster »

Kman - What is going on with your heaters,BTW? I didn't see this before... Why don't you have pin 9 wired up on the 12AX7s? Are you running DC here? I must have missed this info.
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karczochrulez
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Re: trainwreck build by karczochrulez in a mcgyver style :)

Post by karczochrulez »

rooster - my amp work very good! (see pic 121) 8)
look at my first post :lol:
pin 9 its a internal tube shield grounded to brass
heaters are 4 and 5
preamp tubes arent 12AX7 or ECC83 :shock:
There are 6n2p-ew USSR military equipment
surprised? :wink:

BTW my wood faceplate will be about 4mm thick
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premiumplus
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Re: trainwreck build by karczochrulez in a mcgyver style :)

Post by premiumplus »

karczochrulez, thank you.
I was feeling sorry for myself because I lost my job almost 6 months ago and I am having a hard time finding work. But seeing what you have done makes me have hope. I wish I could play some guitar with you but you live too far away from the USA! Keep up the great work! :D :D :D
Making the world a better place...one amp at a time!
karczochrulez
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Re: trainwreck build by karczochrulez in a mcgyver style :)

Post by karczochrulez »

I am not disapeared yet :)
Now I fight against hiss/hum. My NOS pots havent grounding shafts! After eliminated that ground loop hum still egsist :cry:
any sugestions?
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rooster
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Re: trainwreck build by karczochrulez in a mcgyver style :)

Post by rooster »

Hi Kman! Take all the preamp tubes out, turn the amp on and tell me if it hums? If not, next plug in the phase inverter (keep the pwr tubes in) and see if that hums?

Keep going like this until you have the hum thing isolated, understood? Then come back here and tell us what happened and wher the hum is coming from, exactly what stage or tube, V1, V2, V3.

If its your pwr tubes by themselves, you will have to check the caps in your bias supply. If this is good, then I am worrying about your OT - you have explained to me that it is rather odd to begin with. The two bobbins/spools of wire within the OT that attach to pins 3 of either pwr tube need to be the same or close - BTW, what is the DC resistance from both pin 3s to the center tap of the OT?

After all this, it could still be your pwr supply caps. Are you sure these are good?

OK. let us know. 8)
Most people stall out when fixing a mistake that they've made. Why?
karczochrulez
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Re: trainwreck build by karczochrulez in a mcgyver style :)

Post by karczochrulez »

thanks Mr Roooo :)
after long fight I found (probably) the source of hum. F****** pots!
I replaced vol pot. Now power hum is a half less, unfortunately I havent the rest pots to replace. Today I wisited electronic flea market. I didnt find any old school 1M pots!
But I find some other things :)
:wink:
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karczochrulez
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Re: trainwreck build by karczochrulez in a mcgyver style :)

Post by karczochrulez »

Humfighting part 2

after replaced rest of pots 50Hz hum still live :?
I replaced V1 shield wires - yellow wires are copper shielded - less microfonic
When I took off V1 and V2 hum desapeared. Now Im thinking about DC filament to preamp tubes
any sugestions?
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