Starting a Simple SE build...

[tubelab.com]

Power transformer hammond 274BX $92.36.......Also can use Allied 6K7VG $50.32

The Allied IS a Hammond. It is bigger (more laminations) than the 274BX because it is rated for 50Hz operation, and it costs a lot LESS. Why would you buy the 274BX? I have used them both and I prefer the Allied.

If you really want a 274BX get it from AES it is $78.95. The 374BX is reported to be better than either of the others, but it costs $116.05.

[oldmanStrat]

Originally posted by tubelab.com


The Allied IS a Hammond. It is bigger (more laminations) than the 274BX because it is rated for 50Hz operation, and it costs a lot LESS. Why would you buy the 274BX? I have used them both and I prefer the Allied.

If you really want a 274BX get it from AES it is $78.95. The 374BX is reported to be better than either of the others, but it costs $116.05.

I was just putting together a list of possible parts. I did end up purchasing the Allied. It was $62 with shipping!

Since I have "the man" himself on the line - can I ask if my PCB is on the way to Littleton MA ??? No pressure - I've got plenty to do...

[oldmanStrat]

Originally posted by VictoriaGuy

I had the audiotropic link incorrect- sorry- it's .net, not .com

Aardvarkash has the link for you, above.

got it. I've been entertaining myself reading his site...

If you don't want to do the 'trick' in the Pointz chassis with the wiring from the PS to the amp hidden in the wood frame, you could just float a nice wood panel in the space between the 2 parts of the chassis.

I am going to drop all the AC below the top plate - it needs to be switched & fused & wired to the rear IEC - so that seems to make the most sense.

BTW, the Pointz MM is a really good sounding amp for your next project.

holy crap. I don't even have the parts for this one yet....!!!!

stop feeding the addiction man!

[VictoriaGuy]

Originally posted by oldmanStrat

holy crap. I don't even have the parts for this one yet....!!!!
stop feeding the addiction man!

You have NO idea what you've gotten involved in!

[tubelab.com]

can I ask if my PCB is on the way to Littleton MA

I took it to the post office this morning (Saturday) along with 3 others.

[boywonder]

Originally posted by oldmanStrat



stop feeding the addiction man!

It's a slippery slope......I haven't got Poinz' EL34 music machine off of the breadboard yet and I am sitting here simultaneously stuffing the SimpleSE and TubelabSE boards

[oldmanStrat]

Originally posted by boywonder



It's a slippery slope......I haven't got Poinz' EL34 music machine off of the breadboard yet and I am sitting here simultaneously stuffing the SimpleSE and TubelabSE boards

Seriously - two tube amps is one more than I really need. I'm just going to build the SE, and then the Fostex FE206E horns (big monster cabinets) then maybe a phono preamp. And I was thinking of building a SS amp for comparison purposes... And thats it.... unless my son wants an amp for college...

Damn. Is there a 13 step program for DIY?

[tubelab.com]

Damn. Is there a 13 step program for DIY?

You that you have got it bad when you find your self building an amp listening to it for a week or so and then taking it all apart so that you can build something else.

After doing this for 40+ years I learn to never cut a transformer lead to length. I leave them long because I know that I am going to need more wire on the next amp. My big Edcor OPT's are in their third amp. and the little guys have been in at least 5. I don't even bother to make a chassis any more, I just screw everything to a piece of wood.

Later this year I might break down and get a modern TV since the newest TV in the house is 12 years old. Of course I will need a "modern" sound system to go with it. This means that I might get to make at least one complete amp this year. There were none last year.

two tube amps is one more than I really need.

Two is more than I really need too, but I can see 6 complete amps and several more in pieces from where I am sitting, and right now, NONE of them are connected to my speakers. What is the number for DIYanon?

[oldmanStrat]

Originally posted by tubelab.com
I don't even bother to make a chassis any more, I just screw everything to a piece of wood.

Thats how my S5 is sitting in my office. I can just see my cat wandering in one day a loosing a couple of lives...

Two is more than I really need too, but I can see 6 complete amps and several more in pieces from where I am sitting, and right now, NONE of them are connected to my speakers.

6 amps sitting there doing nothing? Dude, send one of them my way and I promise I'll keep the tubes warm

What is the number for DIYanon?

First you have to admit you have a problem...

[oldmanStrat]

Ok - so I'm going through the parts from Digikey that just showed up and I re-read the note on R17/R27 - the cathode resistors. Wanting to double check the value, I tried to figure out an approximate B+ voltage...

Now if I have 750CT transformer or 375-0-375, my understanding is that this is an RMS number. Which would leave me with 375/.707 or 530V!

Now I know this is wrong. What I don't know is why...

Lastly I want to sneak in a motor run cap question - these caps seem to be spec'd fairly low in value (10-20uf) and as AC. I believe that this would be installed on the B+ (optional cap on the schematics) - so the question is why? There is already a 100uf there... if I'm way off track feel free to let me know.