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Old 19th August 2006, 06:09 PM   #91
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Industrial Gainclone:

I built one to test speakers -- you only need a couple of watts -- the case was discarded when they upgraded the music system in our parish -- nice beefy transformer with 2 24,000uF caps -- I used star grounds throughout, polypropylene snubber across the diode bridge, insulated BNC connector with a post to which I attach the signal source's chassis ground. the two blue "superbright" LED's are connected to the respective power supply rails and bleed down the power supply capacitors at around 20 milliamps. distortion at 1kHz is around 0.007% which is decent for an LM3875:
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Old 20th August 2006, 01:33 AM   #92
troystg is offline troystg  United States
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"upgraded the music system in our parish"

Church or state?
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Old 20th August 2006, 01:36 PM   #93
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Quote:
Originally posted by troystg
"upgraded the music system in our parish"

Church or state?
In the People's Republic of New Jersey we have towns and villages and a tax-collector as feared as that of any French nobleman.

St. Rose -- a Catholic Church which tried to pretend it was High Church U.K. style until the "new people" moved in. New people refers to those like me, who are of mixed European heritage

The old system was giving them fits -- this little amplifier wasn't working -- looked like one of those old ILP units -- I've had it hanging around for about 5 years.

If I shielded the EI core transformer I bet I could knock the THD down by a few more 0.001's.
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Old 20th August 2006, 07:56 PM   #94
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Quote:
Originally posted by jackinnj
looked like one of those old ILP units
I just had some of those dropped in my lap (NOS) + a pair assembled into an amp.

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Old 25th August 2006, 12:54 AM   #95
Sherman is offline Sherman  United States
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Default Have a Cigar

Here is my cigar box GC. I built this one with Brian GT boards. I sold it to make room for more.

This pic shows the amp, the power supply and the umbilical I made with Molex connectors.
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Old 25th August 2006, 12:56 AM   #96
Sherman is offline Sherman  United States
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Default The rear

Here is the rear of the amp. Four sources and dual binding posts plus of course the connector for the power umbilical.
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Old 25th August 2006, 12:58 AM   #97
Sherman is offline Sherman  United States
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Here is the inside of the amp.

The box is lined with aluminum tape for EMI/RFI shielding.
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Old 25th August 2006, 12:59 AM   #98
Sherman is offline Sherman  United States
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Finally the inside of the PS. This is the (in)famous center tapped trafo PS. I've not been able to duplicate it as I only had one of those particular trafos.
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Old 25th August 2006, 01:07 AM   #99
Sherman is offline Sherman  United States
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I started cutting metal today for a decidedly different GC. This one will be housed in an old Shuttle PC case. It will be valve buffered with the valve visible through a window in the front panel.

I plan to have remote volume and source selection in it as well. I currently have the volume and source selection boards in another case as a "passive pre" for my KT88 SE monoblocks.

The design means 4 trafos- one for the amps, one for the valve HT (I'm planning for a B+ of 200 volts on a 6922 as a cathode follower), one for the valve heaters and finally a tiny twelve volt unit to power the remote volume and source selector.

It sounds great as I had it laid out and operating on my bench a few days ago.

It should be interesting to make it all fit. I'll post pics when I get around to taking some.
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Old 27th August 2006, 08:39 PM   #100
Asen is offline Asen  Bulgaria
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You can see more pics here:
The SEAMASTER GC
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