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Old 31st January 2012, 06:17 PM   #531
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Quote:
Originally Posted by John L View Post
Where can I put that tube so it looks like it really belongs?
Only you can answer that question.
I think the amp looks just fine the way it is. Long wires with high AC current cause noise in the input section of the amp.
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Old 31st January 2012, 06:30 PM   #532
rknize is offline rknize  United States
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If you are going to relocate the rectifier tube, run the secondary B+ and heater wires to the socket instead of the PCB. Then you can put it where ever you like. If you are going SS, then you need to account for the missing tube drop (about 15-20V).

As far as relocating the other tubes, it should not be a problem provided you keep the leads between the sockets and PCB short and neat. The circuit is pretty stable.
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Old 31st January 2012, 07:21 PM   #533
John L is offline John L  United States
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Yeah, that's the best way to travel. I'm really learning a lot so far, and I appreciate the help greatly.
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Old 31st January 2012, 07:30 PM   #534
rmyauck is offline rmyauck  Canada
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I would keep the 5AR4 for the slow ramp up of the B+ it gives, which George mentioned is very beneficial. You can put it where you want and add the diode mod with UF4007 or better (quieter) for longer rect. tube life. Todays rect. tubes aren't built to as high a quality so this helps take a lot of the load and still get the slow warm up of the 5AR4.

Actually you could probably skywire the output tubes too if you do it right as the Dynaco ST-70 and Mark III etc. did it successfully.

tube rectifier diode mod

Randy
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Old 31st January 2012, 08:12 PM   #535
John L is offline John L  United States
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what is meant by 'skywire'?

I have done a search and all I get are Youtubes to some animation program, or a music group.

I notice that in George's and Ian's schematics, it calls for PT secondary connections to be to numbers '4' and '6'. I compared it to the rectifier diode mod, which shows the 5AR4 leads going to '5' and '7', and the diodes going to '4' and '6'.

Does this mean the original schematic had the 5U4 in mind?
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Old 31st January 2012, 08:29 PM   #536
rmyauck is offline rmyauck  Canada
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I'm using George's term for mounting the output sockets remote from the board to use a different type of tube.

I believe 5AR4 is what George spec'd. The diodes are put on 5 & 7 as they are unused pins. This saves using a terminal strip.

The diodes have to be in series to the rect. tube as shown.

Last edited by rmyauck; 31st January 2012 at 08:33 PM.
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Old 31st January 2012, 08:54 PM   #537
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This how to use SS diodes only.
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File Type: jpg Diodes_1_top.jpg (150.0 KB, 360 views)
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Old 31st January 2012, 09:24 PM   #538
John L is offline John L  United States
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Quote:
Originally Posted by rmyauck View Post
I'm using George's term for mounting the output sockets remote from the board to use a different type of tube.

I believe 5AR4 is what George spec'd. The diodes are put on 5 & 7 as they are unused pins. This saves using a terminal strip.

The diodes have to be in series to the rect. tube as shown.
I'll have to go back and reread that entire section again, just to familiarize myself with it.

Quote:
Originally Posted by brucetassin View Post
This how to use SS diodes only.
I remember that picture, but didn't follow the point all that closely before. That's what happens when I am in too much of a hurry. Next time I'll make sure and process it.

I'm going to use the tube though, now that I can bypass the pcb. Setting it in front of, or next to, the power trans is where it should be placed anyway.

I think so anyway.

Last edited by John L; 31st January 2012 at 09:27 PM.
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Old 31st January 2012, 09:55 PM   #539
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Heres the same power supply, one with SS diodes, the other with a tube.
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Old 31st January 2012, 10:43 PM   #540
rmyauck is offline rmyauck  Canada
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Pic of Dynaco St-70 with output and rect tube separate of PCB.

AudioKarma.org Home Audio Stereo Discussion Forums

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