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Old 3rd December 2003, 04:20 PM   #91
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Join Date: Nov 2003
Location: Helsinki
Hi all,
Here is my class A triode pre-amp.
Tubes 2*12BH7A Golden Dragon and EZ-90 from Philips
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Old 4th December 2003, 07:52 AM   #92
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Join Date: Nov 2003
Location: flyover country
Default my DC coupled stereo OTL amplifier

This is a webcam type pic, so sorry about the sorry quality. I thought this amp would be a natural in a fireplace.....you get the heat, plus, with a mirror in back, even an orange glow

I've used this amp almost continuously since 1988, although I've rebuilt and upgraded the power supply - you wouldn't want to know how many corners I cut in the original version -for instance, I originally used a 1400VA toroid kit without winding any secondary, instead taking one of the primaries as a half wave rectified source for the output stages, but for the last ten years, it's got a 700VA toroid with proper homebrew secondaries for the sixteen output 6AS7G supply rails and their filaments.

It's a fully balanced all triode design (except for the DC level shifters that use pentodes as current sources and as part of the output stage bias circuit, but the signal doesn't pass through them, so they 'don't' count)

This amp does respond down to DC, although I don't hate my speakers enough to not at least roll it off to unity gain down there. There is no servo offset control and no silicon devices anywhere in this amp except for supply rectifiers. Only negative feedback provides offset correction. I recently took it off the shelf where it had been sitting for two years & powered it up. One channel was sitting at 25mV dc and the other at about 100mV dc - hadn't been adjusted for at least four or five years & this with three fresh 6AS7G's (some had been mechanically damaged during storage) and snapped this pic after playing it for a few hours this evening.

I think this amp probably still has more than half the original tubes in it
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Old 4th December 2003, 10:10 AM   #93
jim is offline jim  Belgium
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Location: Leopoldsburg - Belgium
Default My preamplifier.

Greetings

Jim
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Old 4th December 2003, 10:32 AM   #94
BillyF is offline BillyF  Singapore
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Join Date: Aug 2003
Location: Singapore
My first DIY 5687 preamp.
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Old 4th December 2003, 02:31 PM   #95
Anh Hai is offline Anh Hai  Viet Nam
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Location: HaNoi-VN
Default My 12AU7 x4 Preamp

12AU7 RCA x4, 6X4W GE, Jensen 1.0/630V out
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Old 4th December 2003, 03:03 PM   #96
Anh Hai is offline Anh Hai  Viet Nam
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Default My 211 Reference Amp

6SL7 Sylvania, 5881 Tung Sol, 211 United Electronic, OPT Tamura
18W/ch
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Old 4th December 2003, 03:06 PM   #97
Anh Hai is offline Anh Hai  Viet Nam
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Default My 300B monoblock

6SN7 - 300B Billington Gold- 5R4 , 7W output
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Old 4th December 2003, 03:12 PM   #98
ChrisP is offline ChrisP  United Kingdom
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Join Date: Dec 2003
Location: Cornwall
Just finished mine after 6 months or so. PSE 300b based on Audio Note Conquest. Managed to underrate the PSU Tranny though, gets too hot after a couple of hours
The case is all fabricated 2mm ally, screw heads filled with bodyfiller and rubbed smooth. Sowter Iron. All done on the kitchen worktop
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Old 5th December 2003, 03:43 AM   #99
Anh Hai is offline Anh Hai  Viet Nam
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Default My simple 300B project

Tube complet : 5692 RCA red base, 6SN7 Sylvania 1950, 300B EH
OPT Hi-Fi National (Japan) very cheap! 6W/ ch
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Old 5th December 2003, 10:25 AM   #100
Anh Hai is offline Anh Hai  Viet Nam
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Default Simple 300B stereo

300B stereo
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