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Old 9th January 2004, 09:57 PM   #31
VictorG is offline VictorG  United States
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Location: Albuquerque
Thanks for the continued help.

I am almost done assembeling the parts list and things are looking good.

I want to include you in my thinking through, just to double check, the particular hammond i was thinking about using was the 1650F

Specs:

1650F
Audio Watts (RMS) 25
Primary Impedence: 7,600 ct
Max DC per side 128 ma.
Secondary Impedence(s) 4-8-16
"these transformers include 40% screen grid taps for Ultra-Linear operation"

The only reason I am double checking this transformer with you is that y your comments yo seemed to be pretty close to commenting on this peticualr tranny save tat you thought the primary impedence wouldbe 3.5k and you didnt think there was a secondary impedence of 16 avail. Were you looking at another tranny that I am unaware of, or did i just read to much into generalized statements?

Anyway, this transformer is in my range, not bad at all pricewise.

Thanks for the continued guidance. I am going to begin a pcb layout soon (just makes it easier for me)

Brian
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Old 9th January 2004, 11:03 PM   #32
Jax is offline Jax  Sweden
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7.6k impedance is a little too high for EL34's unless you are going to run them in class B with 800V plate

1645, 1650K or 1650N would be better. If money is tight, go for 1645.
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Old 18th January 2004, 07:45 AM   #33
VictorG is offline VictorG  United States
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Default Power Supply

Jax-

You'll be happy to know (or at least I am) that i have aquired around 75% of the nessesary parts.

Now for the power supply-

Any thing I should know, or just get the votage through the bridge rectifyer and put some caps in parallel? Let me know what I should do here, as i dont see any info on this componenet of the system.

Thanks,
Brian
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Old 19th January 2004, 09:46 PM   #34
Jax is offline Jax  Sweden
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As a starter, for the 350V supply:

280-0-280V AC to a fullwave rectifier with 2 1N4007 diodes, a 22uF 450V cap, a 10H choke and a 100uF 450V cap forming a CLC pi filter.

or:

300-0-300V AC to a 5AR4 or GZ34 rectifier tube, same choke and capacitors above. You need a 5V 2A winding for the rectifier heater also.

You can use a 5U4 rectifier tube also but you need 320-0-320V and 5V 3A.

This is for one channel. If you want to share for both, go with the semiconductor diode version.
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Old 2nd February 2004, 06:37 AM   #35
VictorG is offline VictorG  United States
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Default last q

real quick, c11 on the schematic is missing a value. rating? Thanks a bunch, almost there.
B
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Old 2nd February 2004, 06:41 AM   #36
VictorG is offline VictorG  United States
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where would you recommend an output level control? 100ohm pot where? thnx again.
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Old 2nd February 2004, 08:06 AM   #37
Jax is offline Jax  Sweden
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You can leave C11 out for the moment, it's only needed if you increase the feedback.

You mean a volume control? Just add a pot at the input.
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