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Old 2nd August 2003, 02:35 PM   #1
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Default beggar's tube amp

hi everyone,

i have searched the net and found this tube amp that can be theoretically made for as low as 90+dollars. i have a few questions regarding this amplifier. it uses 2 pcs of 60fx5 tubes.
if this is a good begginer and simple diy amp, i can do it.
1.)how does this tube sound?
2.)is it possible to make this design in stereo?
3.)what are your opinions for this amp?
4.)is it possible to modify the schematics to make it have rca inputs ?because in what i have seen, it only has a headphone type input.

the websites are:

http://www.heggeseth.com/tubes.asp
http://www.angelfire.com/ma2/AdamVon/tubeamp.html
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Old 2nd August 2003, 03:19 PM   #2
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Hi,

Basically this is a PP spud, it only uses the IS xformer to split the signal and feed the output tubes.

1) No idea.

2) Sure.

3) Utterly simple, not much can go wrong, quality will depend on iron used.

4) No problem whatsoever, just ground the bottom end of the IS xformer and wire the RCA hot end to the top of that xformer.

Cheers,
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Old 2nd August 2003, 03:28 PM   #3
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Default 60fx5 pp amp

Hi,

I have built this amp about two years ago and listened to it for a while befor I took it apart to build something else....
The problem with all these simple designs is that because of the small part count every part needs to be of very high quality to perform properly and they all need to be matched together. Any way, in my case I was not able to find a good input transformer for a good price so it did not sound that well. I have rebuilt the amp later on with out an input transformer and it performs much better but again, I had to swop 4 sets of output transformers, 3 sets of tubes and two sets of caps tyo get it right. so make sure this is what you want to do before you gump in.

If you want my schematic, please let me know.

glass_painter.
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Old 2nd August 2003, 11:53 PM   #4
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Hi,

Quote:
The problem with all these simple designs is that because of the small part count every part needs to be of very high quality to perform properly and they all need to be matched together
And you think that in more complex designs the problem erases itself?

Don't think so....

What matters here is good quality iron and components to extract the best possible performance, as it would for any other topology.

The idea is simple enough and is a concept I, for one, would give more credit than all the simpleton, rubbish SE designs I see popping up on a daily basis.

Well worth trying,
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Old 3rd August 2003, 02:13 AM   #5
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hi

glass painter, i'd like to see your schematics for this amp.thanks.
but do you have the parts list as well?and how does it sound?

do you guys think that this project is a good first time project that can expose me to the warm tube sound?if not what can you suggest that can be as simple as this to make?


joey
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Old 3rd August 2003, 04:30 AM   #6
halojoy is offline halojoy  Sweden
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Quote:
Originally posted by moonshow
hi
glass painter, i'd like to see your schematics for this amp.thanks.
but do you have the parts list as well?and how does it sound?

do you guys think that this project is a good first time project that can expose me to the warm tube sound?if not what can you suggest that can be as simple as this to make?
joey
Here is a compressed image from link provided at in first post in this thread at this forum.

The Complete Article from Popular Electronics can be downloaded
from the first link. Full building instruction In this pdf:
http://www.heggeseth.com/Popular_Ele...o_Tube_Amp.pdf

some facts:
InputTrafo AES NO. P-T157
OtputTrafo AES No. P-T1608
+92VDC to plate/screen

Originally Featured in January 1995 Issue of Popular Electronic
Redrawn by Adam Vaughn
Image Copy from internet by halojoy
Attached Images
File Type: gif adam_vaughn_60fx5.gif (28.5 KB, 396 views)
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Old 3rd August 2003, 09:12 AM   #7
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Default 60fx5PP

Hi,

This is the design I ended up using as my headphone amp:http://photos.walla.co.il/ts.cgi?tss...8031200056475.

As a reply to Frank... I had the chance to build about 20 or so amplifiers in the last 25 years and still think that multi stages amps have more things you can tweek in order to get it to work properly then minimal design ones.

The amp above is running on 110v dc all over including the filament (the filament is running from B+ filtered DC as well).It is very quiet with a very nice sound. However, you veill need about 3v ac to drive it to clipping and it is of allmost no use for speakers (very low power).

Enjoy.

Glass painter.
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Old 3rd August 2003, 09:16 AM   #8
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Hi,

I am sorry, the right address is:http://photos.walla.co.il/gil_lavi

....Still practising this stuff...

glass_painter
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