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Old 22nd January 2009, 08:25 AM   #701
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strange I build 4 amp never have one problem...
by the way the classD suck ,better you look at Mr Pass or similar
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Old 22nd January 2009, 11:08 AM   #702
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Quote:
Originally posted by ikoflexer
I was going to do the Gary Pimm tube phono stage next, but
Gary Pimm's is one of the very few really worthwhile valve DIY things out there along with Steve Bench's. For easy and fast making, easy changing to MC, no step ups, certainly low noise, better start with the JFET though. Terribly cheaper than the tube ones and very close to character.
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Old 22nd January 2009, 02:33 PM   #703
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Quote:
Originally posted by nicoch46
strange I build 4 amp never have one problem...
by the way the classD suck ,better you look at Mr Pass or similar
I got the soldering wrong (shorts) and all hell broke loose. Now, that's surprising, to hear someone that has a truepath saying that it sucks ) One thing is sure, I don't think I'll go down that road again. Mr. Pass's work looks very impressive, never heard one though. Any particular one you'd recommend?

And not to be totally off topic, I got the 2sk170 so I hope to get a prototype finished this weekend. Can't wait to hear what it can do.
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Old 22nd January 2009, 03:19 PM   #704
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Quote:
Originally posted by ikoflexer
And not to be totally off topic, I got the 2sk170 so I hope to get a prototype finished this weekend. Can't wait to hear what it can do.
Related ideas and open discussion are never off topic in my thread.
To hear what it can do, there are a few things to be well aligned (TT, gain, ancillaries, parts quality), so all that are in topic.
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Old 22nd January 2009, 06:07 PM   #705
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nice place for hot class A

F5 or miniA

As usual Salas know better then me.....


PS
truepath is good but not HI-End, and my amp is not so hiend....
for now
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Old 23rd January 2009, 03:29 AM   #706
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Quote:
Originally posted by nicoch46
Toronto

nice place for hot class A

F5 or miniA

As usual Salas know better then me.....


PS
truepath is good but not HI-End, and my amp is not so hiend....
for now
That's right we could use some class A heaters. I'll have a look at those, thanks.

Well, guys, I think I might be ready for the phono pcb. Any suggestions/opinions welcome.
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Old 23rd January 2009, 03:47 AM   #707
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This is the schematic the pcb is based on.
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Old 23rd January 2009, 04:07 AM   #708
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And here are the files needed to print from expresspcb to create a board.

The way I create a board is by printing on a laser printer onto glossy inkjet paper. I'll outline the procedure, might be useful to someone.

1) add a printer in Printers & Faxes, setup for darkest possible printing (under printer preferences)
2) add another printer, also on darkest setting, but change the preferences to Mirror, so that you can also print the silk layer on top of the pcb
3) load the .pcb file in expresspcb, print the bottom layer on the printer setup in 1)
4) then print the silk layer and text on the Mirror printer setup in 2)
5) clean up the copper side of the board with alcohol, or acetone, and then place the printout on the copper, on top of it a clean sheet of paper, and heat up the iron a little lower than the cotton setting. Iron the printout carefully for about two minutes, making sure that you press pretty hard, especially with the edge of the iron across the entire board. Also, make sure the iron is not set on steam.
6) let the board cool completely, and then carefully remove the stuck printout; I do it under water, and rub out with my hand as much as possible of the paper, making sure that anywhere I want the board to be etched, it should be clean of any paper.
7) etch the board in etchant
8) clean up the laser toner printout from the board with varnish thinner

You can get professional looking boards this way.
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Old 23rd January 2009, 05:57 AM   #709
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Default Layouts

ikoflexer,

This really great for idiots like myself.

Is it possible you can save those two layouts you have done in bitmap and post them up. Then I can just go over them removing the parts and print the tracks off with my laser printer and iron them on to the boards.


Thanks for doing this layout


Brett
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Old 23rd January 2009, 08:56 AM   #710
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for ground route good pratice are

connect direct the in&out RCA gnd
connect in gnd RCA to pcb gnd
use the out gnd pcb only for screen without connect the wire on RCA out gnd

if you want do this are better put the pcb in the parralell to back side of box ,for very short wire....(RCA for pcb ?)

inportant are put the trafo in separate box ,if you do, use EI split coil ,cheaps and are good filter for dirty AC.....

box better alu , hammond diecast are cheaps and good for RFI
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