We are out of control, Clint E. and me, that is.

Look what Alvaro has just won on ebay and is passing on to me.

Output tube: 805 ×2
Input/Driver tube: 12AU7 x2,6DJ8 x2
Rectifier tube: 5Z3P x1
Output power : 45W×2 RMS (Class A)
Lose true degree : 1% (at full power)
SNR : 91dB
Frequency response : 12Hz-200Hz (±1dB)
Load impedance : 8ohm or 4ohm
The power consumption of power source:200W
Input Jack: 2 groups, 1x Power Amp Input
Length 250mmx Height 300mmx Depth 370mm
Weight: 28kg
Power: 220 / 110v

In the space of a few hours I got a couple of great deals. How lucky can one get?

Jorge

bwu hahahahaahaha!

ebay is now classified as a disease.

elroy

...kind of "Yellow Fever" in this case, doctor...

i've bookmarked this thread for future reference ...

I recall Elroy saying it was all your fault. I don´t recall anyone ever saying you weren´t right, though...

Jorge

You know what they say about a stopped clock...

Still, I have to agree with him this one time, you guys are dangerous when on eBay. That's a good looking tube amp though, it just exudes power ... and heat .. but mostly power. I'm guessing "lose true degree" is Babelfish for distortion? Also, is this a SET amp? I know the 807 is a triode, but I've no clue about the 805.

- JP

The 805 is a triode, which when ran in SE pushes around 20 / 22 watts per channel, so I figure this one to be a PP.

After I disable the source switch and volume pots it should make for a nice 4 th channel in my 4 way active speaker system, which at the moment, is running 4 drivers / 3 way with the help of a passive crossover for mid / highs.

My first triode power amp ever, so I´m pretty excited about it, even though it´s not a SE unit as I would like to have driving the midrange horns.

Jorge

Its not? Is it mono then? If it's push-pull, I'm wondering where the other two output tubes are?

That's a very nice looking amp.

John

Nice heater Jorge! You and Alvaro are excellent role models.

Good grief,

Of course it´s gotta be a SE.
How stupid can one be?

I checked Antique Sound Labs site, where they have a model based on the same 805 tube pushing 50 watts in SE mode. It seems I was confusing this one with the better known 845.

Thanks John for clarifying this.

Jorge

That 805 is a big boy. Here's the specs:

http://www.nj7p.org/Tube4.php?tube=805

125w plate dissipation per tube! Look at the old-school class-B push-pull ratings- 370 watts for a push-pull pair, on 1500v B+!

These tubes were commonly used in the audio amp/modulator stage of AM radio station transmitters... usually, something like an 805, 813 or 828, in pairs or parallel-push-pull quads, would feed into/drive something big like an 892, which in turn would feed something like an 862 (5 foot tall triode!) or 5671 pair in push-pull, for 50-100KW (yes, KILOWATTS) of class-B audio-frequency amplification. This modulator audio-amp would then be used to modulate the carrier amp (which usually also used similar tubes in an oscillator and either class-B or class-C stage), in plate-modulation mode.

Regards,
Gordon.

That´s a great piece of info, GordonW, thanks for sharing.

Gosh, I feel small, and so, oh so, ignorant

Jorge