First amp almost finished - thinking about my second

[Tapsnap]

Thanks to everyone for their help and guidance. I am almost finished with this, my first amp. Still have to change the grill cloth and make a  few minor changes. It sounds great and I am really quite proud. It's 4W single ended with an 12AT7 and 6BQ5 pentode. It begins to overdrive at around 7 on the volume. I deviated from the schematic a little with a second jack socket that gives me a normal and bright. and I included a cathode bypass capacitor on the input side of the preamp. The schematic was designed by Rick Campbell of Rick-tone amplifiers.








I'm now looking at another one of Rick Campbell's designs. This time its a push-pull.



Looking at the power supply, I'm a little unsure about what I should buy. I am looking at this one. What do you guys think.
https://www.tubesandmore.com/products/transformer-hammond-power-125-0-125-v-100-ma

[kagliostro]

Nice Job   


Franco

[shooter]

Don't use the CT on the tranny, expect a little higher volts loaded (250*1.414=350vdc).  what are the power tubes?  6V6, EL84's should be fine, 100mA might run somewhat hot depending on your #'s

[pullshocks]

Great looking amp build.  I like the angle you used on the speaker baffle.  Cosmetically, the name plate gives it a lot of flare.


But I really want to know more about the guitar.  I couldn't help noticing it  has the same logo as the amp.....

[sluckey]

Complete schematic...

[Tone Junkie]

Looks great, welcome to the addiction. I would go with a transformer at 190-0-190.
Bill

[Tapsnap]

Sluckey, you are correct that is the schematic I am using. Tone Junkie, you're thinking that I should use the center tap and one half of the secondary, right? Pullshocks, that is a guitar I designed and built myself. I designed it about 25 years ago but didn't get around to building it until 3 years ago.

[shooter]

I should use the center tap and one half of the secondary, right?

That is a bad Idea, it "works", my breadboard is currently set that way, but the Correct way is get a PT that works end to end.  The CT is used OR not, depending on your rectifier.  The CT is NOT used as 1 leg of your secondary AC

[Tapsnap]

In that case, this is the closest transformer I can find that would be suitable. https://www.tubesandmore.com/products/transformer-hammond-power-125-0-125-v-100-ma Unless anyone here can guide me to a bigger selection of transformers.
By the way, why is it that the manufacturers of transformers have to be so mysterious about the value of their products? Put some goddamn specs on your transformers!!!!!

[bnwitt]

Tapsnap,
Where did you have the amp front Logo made?

[Tapsnap]

bnwitt, I had it 3D printed form a 3D model that I made in a program called Lightwave 3D. Originally I drew it out on paper, scanned that, and brought it into Adobe Illustrator, where I made it into vector Art. I imported that into Lightwave3D and extruded it into a 3D object. Then after a lot of manipulation, cutting welding, merging and fixing of the mesh to form one enclosed mesh object, I saved it as an STL file and sent it to Shapeways 3D printing. (All together it took about 6 hours). Ten days later I got back my Logo.

[mresistor]

What about this company and here is an example that might work.  Probably over rated for your use though..


http://www.edcorusa.com/xpwr146

[Tapsnap]

That looks good, but might this be better? http://www.edcorusa.com/xpwr012

[sluckey]

That looks good, but might this be better? http://www.edcorusa.com/xpwr012

That's perfect. But you'll have to remove the bridge rectifier and use a conventional full wave rectifier (two diodes) with the center tap connected to ground.

[Tapsnap]

OK, good. Thanks for your help and thanks to mresistor for showing me that website

[mresistor]

I"m miffed  I thought you were looking for 175 to 200 VAC on the secondary which it shows in red on the schematic.

[Tapsnap]

Yeh, what's the problem?

[birt]

lookin' good! (and that guitar.. wow)

[mresistor]

Yeh, what's the problem?

Are you using only half of the secondary on the Edcor xpwr012?

[sluckey]

If he follows my suggestion he will be using the entire secondary of that Edcor xpwr012 and he will have exactly the same B+ as the original PT provides.

[mresistor]

Neve mind --  brain fart.. 


Tapsnap - that's a beautiful amp you made and the guitar is also really nice..  Congrats..