October 13, 2011 at 2:45 am #5193
use those transformers to a two stroke amp?
I live in EU so it’s not easy to find the rigth parts
– Thanks HumleOctober 13, 2011 at 8:17 pm #5523AndyKeymaster
The OT is spot on, exactly what is called for.
The PT looks to have the right specs too. Not sure about the mount for the chassis. If you were making your own it’s no problem.
What are your chassis plans?October 13, 2011 at 8:28 pm #5524
The ES-125 will work without issue. The 290 AEX PT only specs 2a for the 5v tap which is barely enough for a 5Y3, 3 or more amps would be better. You could skip the rectifier tube and make a solid state version. It would be cheaper, have a little more output and tighter bottom end. Super simple to build. Or, find another PT.
Good luck, this is a great little amp.October 20, 2011 at 4:15 am #5525
Robin: do you have a Layout or a Schematic of how to do?
But if I skip the rectifier tube, will it still be better with more a?
ajswanson: I Will make my oven chassis.
Thanks HumleOctober 20, 2011 at 9:08 am #5526
Easy to do. I have a schematic in my 2Stroke photo album. To make it super simple (assuming you will be including a rectifier socket on your chassis) you can use the 4 unused solder lugs on the socket at solder points for the 4 diodes. If you are not going to use a rectifier socket, just make a little eyelet or turret board to hold the parts, you could even just wire them up point to point. Check out my second 2Stroke photos, you can see the four diodes in a row on the left end of the component board.
Let me know if you need more info.
I didn’t understand the second part of your post “better than a”?October 20, 2011 at 5:03 pm #5527
If I skip the rectifier tube. Are the PT(2a for the 5v tap) OK?
Or would it be better to find one with some more amperes?October 20, 2011 at 9:55 pm #5528
If you skip the rectifier, you won’t use the 5v taps as they are only for the rectifier tube filament. The 6.3v taps are for the other tube filaments (heaters) and the high voltage taps are B+. Be sure to connect the heater with a twisted pair of wires ( for hum reduction). If your PT does not include a center tap for the 6.3v taps, you will need to make an “artificial center tap” by adding a 100 ohm resistor to each of the 6.3v leads going to chassis ground. This is for hum reduction and is especially important in this single ended design. So……the 6.3v circuit will have a center tap and the B+ circuit will have a center tap, if the transformer has any other taps, do not ground them. Either coil up the extra taps and add heat shrink tubing (or tape) to the ends to prevent them from touching anything or cut them off.October 24, 2011 at 12:31 am #5529
Ahh Thanks! I hope to have the money to start my project next month.
I will let you know how it goes. Maybe I need some more help.
But many thanks for the help!October 24, 2011 at 9:08 pm #5530
Good luck!December 1, 2011 at 4:54 am #5500
If I skip the rectifier and use diodes. Is this PT ok?
And this OT?
Is this ok..?December 3, 2011 at 3:48 am #5501
It appears that those would work for the 2 stroke circuit.December 3, 2011 at 4:06 am #5502
Nice..! Thanks a lot!
Then I will order the parts for my Two-strokeDecember 3, 2011 at 4:08 am #5503AndyKeymaster
Those are some nice looking transformers. Please keep us posted as to how they sound. I like the mounting and the lead dress (or lack thereof) on those. Nice.December 3, 2011 at 4:21 am #5504
I will do.December 16, 2011 at 6:55 pm #5510
I finely got my PT and OT
but I am a little unsure of how to connect the OT..
My plane is to use one 6v6 tube with one 8ohm Celestion G12M speaker.
The OP have 5 taps at the primary and 4 at the Secondary.
is there some one there can explain me how to connect the primary?
I expect that I just need to use the 8ohm and the 0 tab at the secondary?
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