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25th May 2012, 10:18 PM
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#1 |
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diyAudio Member
Join Date: Jul 2010
Location: Christchurch
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Looking for Phono Stage ...
Hello there yet again Folks. I am asking for some input from those that have so much more knowledgeable than myself. I really appreciate the way that ALL the Folks out there are so willing to share their information with those that are less experienced. Just what a great forum diyAudio is... MANY THANKS...
OK now down to the nitty-gritty... I have attached a part-circuit of just what I have at present and this amplifier is for CD input only at present. The input tube is a single ECC83 ( 1/2 per channel ), driving a single 6V6 in Class A mode. I am using a single 50K log pot on the input at this stage. What I imagine for the additional PHONO input is that I would have to use a full ECC83 per channel now, to get more gain for the phono input. The cartridge output requires 47K impedence and has an output of 4.5mV. ..... 2 RCA inputs with a switch between 'CD' and 'Phono' would be my idea ???? Any help with a SIMPLE circuit would be very much appreciated and I look forward to hearing form anyone that is willing to help.... Many thanks yet again.... Keith, New Zealand |
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26th May 2012, 12:29 AM
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#2 |
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diyAudio Member
Join Date: Apr 2004
Location: Plainsboro, NJ
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Keith,
No phono preamp is truly simple, sorry. However, some designs are not overly complex. The tweaked RCA setup I've uploaded is about as easy as it gets. You live in a 240 V./50 Hz. mains zone. You have to come up with a PSU that produces 300 mA. of 12 VDC for the heaters and about 10 mA. of well filtered B+, in the 270 to 300 V. range. Install a LR8 regulator configured for 250 V. in the B+ line of each channel.
__________________
Eli D. |
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26th May 2012, 01:30 AM
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#3 | |
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diyAudio Member
Join Date: Jul 2010
Location: Christchurch
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Quote:
   Attached is a pic of the little amp as I have it now, suppose there is much that is not totally correct  .... But in the end it does sound great on CD, but as requested... A bit of CD AND MM Phono would really be nice....Thanks yet again.... Keith ..... NZ |
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26th May 2012, 12:02 PM
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#4 | |
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diyAudio Member
Join Date: May 2012
Location: Near Huntingdon, Cambridgeshire, UK
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Quote:
 Les. |
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26th May 2012, 01:19 PM
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#5 |
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diyAudio Member
Join Date: Aug 2008
Location: Roswell GA
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I have been tweaking my Tubecad.com Tetra Sans PS now for a few weeks.
It is a pretty simple build of a CCDA topology and the board is very high quality. One thing is certain, the coupling capacitors are CRITICAL to the sound. I initially had cheap WIMA's in and just switched to Solens. The improvement was soooo good that I will now save up for some Mundorfs or Auricaps or something like that. This one has 4 so it is easily an $80+ upgrade after shipping etc... |
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