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henry4841

Pictures of your Tube Amplifiers

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BTW Bruce:  The extra octal socket in the Moondog top-plate is not 'overkill' per se.'   W. Labs made use of the same chassis plate that was used for the Laurel 300B, which required it for the additional octal valve used in that design over the Moondog.  So, maybe we can substitute 'overkill' with....I dunno....frugal, perhaps? ;)  

 

I know I mentioned this many moons ago, but hey....so what.

 

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11 hours ago, Davecv41 said:

My former 45 amp, built on a mounting bracket from a used shipboard keyboard in 1997, schematic was from an article in Glass Audio. The power transformer burned out once, I replaced it, then stripped it when Maynard came out with the Lil Sweetie schematic. Not the best layout here, the parts had to fit the available space.

IMG_5358.JPG

Tell members about how they sound to you. 

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2 hours ago, henry4841 said:

Tell members about how they sound to you. 

Details have faded over the last 20+ years, but I don't feel this schematic was well designed. I got about 30 minutes out of it connected to a pair of HIIs when the high voltage winding in the power transformer opened. It had been over a year since I ordered it from Antique Electronic Supply, so well out of warranty. I wrote a letter with a copy of the schematic to AES explaining what happened, and got a reply from Mr DeFir, the owner. He analyzed the circuit, and said one winding was overloaded, but the other was not, so he felt the transformer was good in the circuit. (I was in the Persian Gulf at the time, he had been a tron chaser in the navy in WWII, and his son was still on active duty, so it was a nice letter.) I ordered another transformer and replaced it, and got it going again. I have 1967 Khorns, and while the sound was clear, it was not a strong amp, which I partly blame on having to run the high voltage winding thru a resistance to drop it. (The gold ones in the picture are in series, so there was no fighting between unmatched parallel parts.) After several years of listening, it developed a hum, so I shelved it, not wanting to invest the calories in it. When Maynard put out his Lil Sweetie schematic, I took the amp apart, reusing just the aluminum chassis and the Hammond 1615 output transformers. There's probably a couple hours of work left before it's ready to fire up. There are now two mono amps on the chassis.

  I am not put off by the 45 tube in the least, in fact, I'm still looking for a better schematic. This amp sounded good.

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I thought you had your Sweetie up and running. That is the one I was referring to. I believe you are going to like it.

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17 hours ago, Marvel said:

 

I appreciate the nice/ beautiful work by those who do the PtP builds, too. Maynard's be at the top of that class. 😉


Actually, I think Mike Stehr’s builds are nicer than mine!

 

 

Maynard

 

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Thought I would join in. Here is my 300B/2A3 SET amplifier. Powers a pair of Heresy III (but can also be used as a headphone amp).

 

High voltage and filament voltage is adjustable for either 300B or 2A3 with switches. Bias is adjustable for the power tubes and 6V6 driver tubes. 

 

Separate power supplies for output stage and input/driver stage. And separate filament supplies for each of the power tubes. Hybrid rectification.

 

Each chassis weighs a ton.

 

Signal chassis:

21777409423_eb4d4937b2_h.jpg

22322680372_031d643b84_h.jpg

 

 

Power Supply:

22210754708_4f17c8dd68_h.jpg

22148825689_e3b74cd63e_h.jpg

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21 minutes ago, henry4841 said:

Lundahl OPT's as well? Looks like a quality build. 

 

The OPTs are actually Tribute amorphous core. The Lundahls are chokes and two filament transformers.

 

The two power transformers (in blue covers) are custom wound by EP (Jack Eliano).

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16 hours ago, jomanos said:

Thought I would join in. Here is my 300B/2A3 SET amplifier. Powers a pair of Heresy III (but can also be used as a headphone amp).

 

High voltage and filament voltage is adjustable for either 300B or 2A3 with switches. Bias is adjustable for the power tubes and 6V6 driver tubes. 

 

Separate power supplies for output stage and input/driver stage. And separate filament supplies for each of the power tubes. Hybrid rectification.

 

Each chassis weighs a ton.

 

Signal chassis:

21777409423_eb4d4937b2_h.jpg

22322680372_031d643b84_h.jpg

 

 

Power Supply:

22210754708_4f17c8dd68_h.jpg

22148825689_e3b74cd63e_h.jpg

 

How long did it take you to get to this point. These look pro built. Amazing.

 

Who did you use for chassis plates?? I'm looking at Landfall and Front Panel Express. I like the new HV printing.

 

 

 

 

 

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11 minutes ago, seti said:

 

How long did it take you to get to this point. These look pro built. Amazing.

 

Who did you use for chassis plates?? I'm looking at Landfall and Front Panel Express. I like the new HV printing.

 

 

 

 

 

 

The original build was maybe 10 years ago. About 5 years ago I re-built the design with changes to the filament supplies; adding the Rod Coleman voltage regulators; and adding a time delay for the high voltage supply. And also re-doing the chassis with cleaned-up PTP wiring.

 

The chassis plates are just aluminum plates which I hand-drilled. Then spray-painted in the foyer of my apartment. (Don't think I'll ever do that again.) I thought about using FPE, but the cost would have been too high. The printing on the plates is just custom dry transfers.

 

Here is the schematic:

17385313371_8b0770c8b8_k.jpg

 

 

 

 

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16 minutes ago, jomanos said:

 

The original build was maybe 10 years ago. About 5 years ago I re-built the design with changes to the filament supplies; adding the Rod Coleman voltage regulators; and adding a time delay for the high voltage supply. And also re-doing the chassis with cleaned-up PTP wiring.

 

The chassis plates are just aluminum plates which I hand-drilled. Then spray-painted in the foyer of my apartment. (Don't think I'll ever do that again.) I thought about using FPE, but the cost would have been too high. The printing on the plates is just custom dry transfers.

 

Here is the schematic:

17385313371_8b0770c8b8_k.jpg

 

 

 

 

Thanks for sharing. What software did you use to draw schematics? Very nice.

 

Anyone can make a great looking chassis from FPE but it takes real skill and ingenuity to do it your way... Amazing..

 

I am planning a 112A Preamp with Coleman Regs. I have all the parts just want the chassis to be perfect. I got power supply modules from intact audio.

 

 

 

 

 

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2 hours ago, seti said:

 

Thanks for sharing. What software did you use to draw schematics? Very nice.

 

Anyone can make a great looking chassis from FPE but it takes real skill and ingenuity to do it your way... Amazing..

 

I am planning a 112A Preamp with Coleman Regs. I have all the parts just want the chassis to be perfect. I got power supply modules from intact audio.

 

 

 

 

 

 

I used EazyDraw, a vector drawing program for MacOS.

 

Yeah, if I build another amp, I will be using the Coleman Regulators again and with Dave's modules.

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I’ve had this one for a while,  it was mostly just sitting and looking pretty. I’m now using it for a dedicated vinyl system, powering ’83 Heresys. I'd forgotten how much I like this amp, and how great it sounds with Heresys. 

6BEE828A-0038-4B76-BF71-FE561E2B40FC.jpeg

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This is an amplifier designed by Bruce Heran of Oddwatt and is available as a kit. He generously supports diy'er's and has published his schematic as you can tell from my build. This is one of the few PP tube amplifiers I own and what is unique about this one is that it is run in class A. I have built a number of his designs and am well pleased with all of them. 

http://oddwattaudio.com/owpoddwatt.html

 

 

P1030828.JPG

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Here are a few.

 

Just finished 1.5wpc 1625 triode wired.

IMG_0504.thumb.jpg.a2d8947e9079e032e8d12206c7284e4b.jpg

 

Knight KB83 or was lol... 4 x EL37, 2 xgz34 forgot other tubes lol but they are bugle boys. This ran so hot we completely gutted it and redesigned it. It is now a PP triode el37 about 10wpc.

IMG_0402.JPG.68e8169861e8bd60952b07d9677935ba.JPG

 

Brook 12A Clones I built including PWK or Moderfari mods.

IMG_3422-1.jpg.48b430d6137824b4c00c134e82793061.jpg

 

A gift from IBSlammin. LuxmanPP triode 50ca10. Just completed cap replacement and putting it back to factory as it has been modified. Going to bring it up this week.

L5-1.thumb.JPG.002bc29ab4f4edef7065b51002716ab3.JPG

 

Next to be rebuilt two EL84 amplifiers chock full of awesome mullard gz34 and el84 tubes. Love the look.

0-1.thumb.jpg.a0e7e7a1c73908508df43a4062a88e26.jpg

 

I love the fisher it has been modified so I am not sure what I will do with it... Looks abit ratty.

fishers.jpeg.ef0cc4ad4afb598fd078d3ce6a722056.jpeg

 

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You have been holding out on us Seti. Really gorgeous looking amplifiers. Shows up my spartan build.  

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44 minutes ago, henry4841 said:

You have been holding out on us Seti. Really gorgeous looking amplifiers. Shows up my spartan build.  

Am sure it's just fine.

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4 hours ago, seti said:

Brook 12A Clones I built including PWK or Moderfari mods.

 

Are those 2A3 P-P designs? I absolutely love the box joints for the chassis plate bases.

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