Show us your flea-watts amps!
- Thread starter davidro
- Start date
Aha Guys !
After looking to all your (nice !) pictures, I think I am still and again the winner in the double category : Flea Power plus Flea Size !
For how long ?
T
That is one of the cutest little amps I’ve ever seen.
tubelectron
Super Member
Thanks @jobrewer1983 !
Despite its tiny size, it still looks like as "normally proportionate tube amp in reduction". I don't think that I can do smaller, while preserving such a look...
Well IIRC, you also have a specialty : the Mono-Steampunk-Speaker-Amp units... Right ?
T
kentuckycat
Active Member
tubelectron
Super Member
I'd be pleased to build an SET with a 45, but prices of these tubes are way too high ! 
T
T
kentuckycat
Active Member
45’s are expensive but out of the 10 tube amps I own, the 45 is the only one that has caused me to turn down the music because I thought I heard something behind me. Really spread-out soundstage.I'd be pleased to build an SET with a 45, but prices of these tubes are way too high !
T
Right now, there are 45’s on ‘the bay’ from reputable and well known sellers in the $50 range that have tested high.
tubelectron
Super Member
You are right... That's what one of my 45 Afficionado Audio Friend told me.
He has a gigantic 105dB/W/m horns and wall of 15 or 18" speakers multiamplified installation, though.
OK : Mine is 93-95dB/W/m monoamplification at best, but I listen to moderate volumes and 1W is no issue at all for me ! If I want more power, I can rely on other amps I have...
Maybe I put the trigger to go for an "Upper-Premium" SET with 45 NOS / 45 FullMusic or TJ or EML / 45B EML... Why not an "Ultimate 45" amp... U-45 ? That would be able to use any model of 45 tube, with some internal parameters switches...
Just a question : Any of you already tested a 45 on a low plate load of 3500 ohms ?
T
tubelectron
Super Member
Yes, that's true - that said, at 3.5K, it would not be very dramatic, I think : a bit more H2 distortion... The optimal load on the 45 graph below is 3.8-3.9K :
I say this because I may be able to buy a pair of TAMURA F-7002 (3.5K / 4-8-16R) Permalloy core output transformers :
T
setup1
Super Member
Nice permalloy OPTs! I've used those with SE300Bs.
I've played around with the 45 since the 90s and to my ears, it sounds best with a 5K output transformer. Over 5K, the sound becomes too lean, under 5K, I lose focus and definition.
My Simple 245 with Tamura F475s and 75 input triodes.
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doctor fuse
Super Member
My $80 CAD Single Ended 6BQ5 amp.
I have reflowed all the solder joints and cleaned the socket pin holders and it sounds so good now.
It is a mystery amp, but I have this info:
Output Transformers: 345 352 18
Power Transformer:1047390-7 (DYL4)
AI is telling me this is a modified Magnovox console pull, most likely 8600 series (8601 or 8602?). Weirdly, it has no preamp tube(s).
And the tube rectifier is gone - there must be some sort of solid state rectifier underneath? And does anyone know what model this is (or was)?
I have reflowed all the solder joints and cleaned the socket pin holders and it sounds so good now.
It is a mystery amp, but I have this info:
Output Transformers: 345 352 18
Power Transformer:1047390-7 (DYL4)
AI is telling me this is a modified Magnovox console pull, most likely 8600 series (8601 or 8602?). Weirdly, it has no preamp tube(s).
And the tube rectifier is gone - there must be some sort of solid state rectifier underneath? And does anyone know what model this is (or was)?
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fortyfive
New Member
Hi DIY brothers,
Here are my 2A3 monoblocks.
The driver tube is an E180F strapped as a triode, running at 175V and 12mA on the anode. The iron is all Hashimoto: A-105 for the interstage and H-20-3.5K for the output transformers.
I went with 2A3 AC filaments, and the hum is only about 1.3 mV. What do you guys think, does it look OK?
Here are my 2A3 monoblocks.
The driver tube is an E180F strapped as a triode, running at 175V and 12mA on the anode. The iron is all Hashimoto: A-105 for the interstage and H-20-3.5K for the output transformers.
I went with 2A3 AC filaments, and the hum is only about 1.3 mV. What do you guys think, does it look OK?
Attachments
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beautiful
Looks great. I'm a big fan of Hashimoto iron.
Here's a couple more:
Red: James Burgess 2A3/45 amp. Bought it on the 'bay in 2022 and it was damaged in shipping. I happen to live about an hour away from the builder so I got it into his capable hands. Original build was done in 1999, he didn't like how he wired it so he completely rebuilt it, and modded it by request to be switchable for 2A3/45 tubes as his current builds sometimes are. About 3 watts. Sounds sublime.
Silver: Flea watt Dennis Had 6EM7 Set Dennis likes to experiment with obscure tubes and this is one of his different efforts. Transformers are HH Scott, I believe. Use it on my bench and it is reliable and sounds quite good.
Red: James Burgess 2A3/45 amp. Bought it on the 'bay in 2022 and it was damaged in shipping. I happen to live about an hour away from the builder so I got it into his capable hands. Original build was done in 1999, he didn't like how he wired it so he completely rebuilt it, and modded it by request to be switchable for 2A3/45 tubes as his current builds sometimes are. About 3 watts. Sounds sublime.
Silver: Flea watt Dennis Had 6EM7 Set Dennis likes to experiment with obscure tubes and this is one of his different efforts. Transformers are HH Scott, I believe. Use it on my bench and it is reliable and sounds quite good.
Attachments
tubelectron
Super Member
Flea-Watts & Flea Sizes...
the Micro-Amp Stereo (2x1W) flanked by the U-6V6 Mono Blocks (2W).
The CD Box gives the scale :
T
the Micro-Amp Stereo (2x1W) flanked by the U-6V6 Mono Blocks (2W).
The CD Box gives the scale :
T
