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Old 10th September 2011, 10:48 AM   #1591
kaban is offline kaban  Australia
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Well, after a year or so rest, my phonoclone fired up pretty well this afternoon!

I've attached some pics of my turntable, phonoclone preamp and power supply.

Can I ask you a dumb question - why should the preamp powersupply have a large Va?
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Old 10th September 2011, 11:40 AM   #1592
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Quote:
Originally Posted by kaban View Post
Can I ask you a dumb question - why should the preamp powersupply have a large Va?
I don't think that changes anything, having large VA. You just need an adequate power supply, with decent filtering.
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Old 11th September 2011, 03:57 AM   #1593
kaban is offline kaban  Australia
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Thanks for the reply. I really love the phonoclone. I want to build a decent tube amp as well... I have built a pair of E.J. Jordan full frequency TL speakers. At the moment, I have a NAD 3121 which is pretty good for its age.
As an experiment I just plugged my phonoclone into the Blueray player surround system's AUX input. It sounds great.
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Old 11th September 2011, 06:41 AM   #1594
rjm is offline rjm  Japan
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Quote:
Originally Posted by kaban View Post
Can I ask you a dumb question - why should the preamp powersupply have a large Va?
Simple answer is larger transformers tend to sound more "solid" and "powerful".

Anything over 25 VA should be sufficient, but 160VA-225VA can be considered an optional upgrade path. Depending on the supplier, there isn't always a lot of different in price vs. VA, so one larger transformer might be more cost effective than two smaller ones.
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Old 12th September 2011, 11:03 PM   #1595
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Where exactly can I order the Talema transformer products?
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Old 13th September 2011, 08:01 AM   #1596
rjm is offline rjm  Japan
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Digikey for example,

Digi-Key - TE62062-ND (Manufacturer - 62062-P2S02)
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Old 13th September 2011, 10:11 AM   #1597
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If you want a PCB-mountable version,Bürklin in Germany stocks them. Exceptionally fast shipping (2-day max in Europe). http://www.buerklin.com
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Old 22nd September 2011, 08:13 PM   #1598
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I measured the Noise Level on my VSPS stage. Pretty good, as there's nothing too exotic component-wise.

This was measured using an E-MU 0404 USB (s/n ratio 113dB - sampled at 24-bit / 92kHz). After setting the sensitivity of the Line-In's to the maximum (without clipping) for a line signal, I came up with the following graph:

Click the image to open in full size.

First of all - the resonant frequency of my cartridge & tonearm seems to be 7Hz, but overall, it's great. Only a little 50Hz and 100Hz noise left, coming from the PSU. But it's at -89.2dB, so no biggie
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Old 24th September 2011, 12:21 AM   #1599
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Since the y-axis is not referenced, I can't say for sure, but whatever hum you are picking up here is most likely through the cartridge. The "true" output noise of the VSPS300 can be estimated by replacing unplugging the phono cable and putting 1 kohm across the input instead.

To calibrate your y-axis, adjust until an input signal of 1 kHz sine wave / 1 V rms returns a peak of 0 dB in the FFT.
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Old 24th September 2011, 09:18 AM   #1600
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Allright, thanks for the info for taking measurements! I disconnected the turntable, put 1Kohm 1 percent tolerance resistors across the inputs, and I've adjusted the input with a 1Khz sinewave to 0dB.

This is what I get:
Click the image to open in full size.
Noise Level - 1kOhm - Calibrated @ 0dB @ 1kHz
50Hz peaks at -91.6dB; I guess it's OK, but I'll be looking at some additional filtering of the power supply. Using 7815/7915 now in separate housing. It's not bad at all, but there's always room for improvement
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