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ZSP1 completed (Read 3965 times)
Steve Deckert
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If the 1st watt
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ZSP1 completed
04/10/09 at 21:37:02
 
Here is a couple pics of a ZSP1 that a customer did last year some time...





-Steve
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Dan
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Re: ZSP1 completed
Reply #1 - 04/15/09 at 04:31:25
 
Mine is finished and working!

I could not calculate the correct resistor value for R7, so I removed it.  My heater voltage is ~6.7 volts AC without it- close enough for now.  I also had a lot of hum-hmmmmm, so I removed the Teflon washers underneath the Al plate, and touched-up some of the solder joints on the potentiometer- much improvement.

One thing I've noticed is that if I turn the power to the preamp off and leave the amp and source on- there is not change to the music volume.  If I change the inputs to the amp there is a definite difference, just wondering why turning off the preamp while everything is connected wouldn't make a difference?  

Anyone have any other ideas as to how to reduce humming from just the turntable?  No such noise when the CD player is running through the preamp, and yes, I checked the ground...

Dan
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Dan
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Re: ZSP1 completed
Reply #2 - 04/18/09 at 04:33:58
 
Okay, its finished- and it sounds great!  Lots of tweaking because I'm not an EE (but I know how to spell it), and this is my first electronic kit.  I am a mechanical engineer, so the kit went together a lot faster than the electronic components were soldered.  I spent much time looking at the schematic wondering how come the schematic was different from the picture of the connections, before realizing that the tubes were drawn in two parts.  I soldered and re-soldered a couple parts so many times that I had to replace them.  But here she is- and she sounds great!

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Lon
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Re: ZSP1 completed
Reply #3 - 04/18/09 at 13:50:46
 
Nice job Dan!
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