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Old 4th December 2011, 05:29 AM   #3761
GloBug is offline GloBug  Canada
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Here ya go, I've been using it for a few days now.
Still needs a wood base when I get to the hardware store next.
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Old 4th December 2011, 05:35 AM   #3762
pageboy is offline pageboy  United States
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I will have to build something that looks like this. I did buy a pair of light fixtures last summer at a garage sale of which the bases look darn near identical to this. I planned to use them in a room in the house here, but... Let's see, house project vs. tube amp. I wonder what will happen.

Could you post the schematic of these?
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Old 4th December 2011, 05:37 AM   #3763
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Quote:
Originally Posted by GloBug View Post
UFO!

RH84 stuffed into a light fixture.
Changes - 6V6, 5Y3
Telefunken 5k OPt's

Sounds out of this world, no pun intended.
Neat. That needs a clear bell jar cover like on an old mantle clock.
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Old 4th December 2011, 05:42 AM   #3764
GloBug is offline GloBug  Canada
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It's basically a RH84 - http://www.tubeaudio.8m.com/RH84/rh84.html

The changes are 6V6 instead of EL84. (I'm using a 330ohm cathode resistor instead of the 270ohm in the schematic. My power transformer has a little higher voltage then called for.)
12AT7 also has been upped to 270ohm from 250.
Also the power supply in mine is a 5Y3 with a 22u-1.5H-80u pi filter. The schematic is using a 5U4 with a bigger choke and more capacitance. I just did what seemed "safe" with the Duncan's PSUD. I wanted to add more capacitance, but was getting warnings using the 5Y3. Sounds fine though.
I get a very small amount of hum, either from the OPT's being close to the PT, or because I'm not using much filtering. It is very tolerable though, I can only hear it with very sensitive speakers and nothing playing.

Yes I do need to find some glass for it!

Last edited by GloBug; 4th December 2011 at 05:46 AM.
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Old 5th December 2011, 05:23 PM   #3765
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Default Hi! My first step in tube sound =)

This is 6N6P SRPP headphone amp. I made delay of anode voltage feed and anode voltage stabilizer.
Thanks to Wawebourn for help! =)
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Last edited by Professor; 5th December 2011 at 05:37 PM.
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Old 5th December 2011, 05:30 PM   #3766
tinitus is offline tinitus  Europe
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smooothie
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Old 5th December 2011, 08:35 PM   #3767
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Professor: too nice.
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Old 5th December 2011, 09:04 PM   #3768
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Worked quite a while on the chassis and the modular way it is built up. Had some people at my place and they all liked the way I 'screwed' this amp together (hardly any solder). I am preparing some better pictures and explanation for a separate thread.

The amp is based on this design by Michael Koster.
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Old 5th December 2011, 09:13 PM   #3769
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And another amp, also based on a design by Michael Koster. I did, however, implement a splitting trafo (LL1540) at the input so it is push pull. Gyrators load the ECC88 triodes and provide biasing from a low source for the 6W6GT triode-wired output tubes.

The green blocks are slighlty modified PCB terminal blocks: they make excellent connecting points as the 'cage' construction does not damage the components: a major problem with my prior experiments: the Borg Collective.
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Old 5th December 2011, 09:16 PM   #3770
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über cool!!!
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