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Old 11th March 2005, 06:49 PM   #1
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Default PSU for perusal

Feel free to LOL! This is my 1st design which is really a hodgepodge of other people's work. Anyway, it's to power my EF86 based RIAA pre using some parts I already have.

Big Q, will it work? I had a tough time getting my head around the 6CA4 seperate heater/cathode thing.

Any & all input would be appreciated, forgive the pencil drawing but I haven't found a simple symbol program for my Mac (don't start-OK).

Thanks, Philip
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Old 11th March 2005, 07:04 PM   #2
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OK that's the PSU post with the pre-amp schematic. Here's the preamp post with the PSU schematic just to keep everyoner on their toes!

Same questions, will it work? Will it eq per RIAA curve? Will you be able to read my chicken scratch?

How about using a single 20H/450ohm choke in the B+ (since I have one)?

Thanks in advance.

Philip
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Old 11th March 2005, 07:20 PM   #3
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here she is...
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Old 11th March 2005, 08:25 PM   #4
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> Will it eq per RIAA curve?

Nope. I think it has the 2KHz-20KHZ drop, but no 500Hz-50Hz rise. See simulation below, ignoring pentode gain (about 40dB-46dB) but accounting for pentode plate impedance.

Output impedance is quite high, can't drive much/any cable. And you can probably eliminate the 470K resistor.

Pentodes have more noise than triodes. In phono amps, it could matter.

Otherwise it all looks fine.

How old are you? I thought I was the last guy to write "0.0033uFd". Kids today use those nano-things. At least I quit writing "3,300 uuFd" (micro-micro).
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Old 11th March 2005, 11:05 PM   #5
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Quote:
> Will it eq per RIAA curve?

How old are you? I thought I was the last guy to write "0.0033uFd". Kids today use those nano-things. At least I quit writing "3,300 uuFd" (micro-micro).
OK here's the next revision. Check it out!

I'm actually 42 years young and I always stick with uF 'cos I'm pretty new to all this & it saves me confusion!

Thanks for the input.

Philip
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Old 11th March 2005, 11:52 PM   #6
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PSU - how about this (trying to use stuff I got):

1 - replace 2 x 10H chokes with 1 x 20H/450ohm
2 - remove 10uF cap, place 100uF cap either side of choke (total of 2)

Thanks
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Old 12th March 2005, 12:53 AM   #7
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Maybe this one makes more sense.... (thanks Bob D)
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