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> Scott´s right...
hifi_nut
Posted: February 20, 2007 04:20 pm
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2nd best ain´t bad either
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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. soundt/banana.gif soundt/banana.gif soundt/banana.gif

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

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bolly
Posted: February 20, 2007 04:26 pm
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bwu hahahahaahaha! soundt/afro.gif
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Elroy
Posted: February 20, 2007 04:42 pm
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ebay is now classified as a disease.

elroy


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clint e.
Posted: February 20, 2007 04:53 pm
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QUOTE (Elroy @ February 20, 2007 11:42 pm)
ebay is now classified as a disease.

elroy

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


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dingus
Posted: February 20, 2007 04:59 pm
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How can people be so cruel?
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QUOTE (hifi_nut)
Scott´s right...

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


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hifi_nut
Posted: February 20, 2007 05:04 pm
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2nd best ain´t bad either
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QUOTE (dingus @ February 20, 2007 11:59 pm)
QUOTE (hifi_nut)
Scott´s right...

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... biggrin.gif

Jorge
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Charivari
Posted: February 20, 2007 05:07 pm
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QUOTE (hifi_nut)
Scott´s right...

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


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hifi_nut
Posted: February 20, 2007 05:24 pm
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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
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blue_lateral
Posted: February 20, 2007 06:59 pm
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QUOTE (hifi_nut @ February 20, 2007 04:24 pm)

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.

Its not? Is it mono then? soundt/confused-smiley-013.gif If it's push-pull, I'm wondering where the other two output tubes are?

That's a very nice looking amp. soundt/thumbup.gif

John


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Mark B
Posted: February 20, 2007 11:29 pm
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excitable boy
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Nice heater Jorge! biggrin.gif You and Alvaro are excellent role models. wink.gif
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hifi_nut
Posted: February 21, 2007 03:14 am
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QUOTE (blue_lateral @ February 21, 2007 01:59 am)
QUOTE (hifi_nut @ February 20, 2007 04:24 pm)

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.

Its not? Is it mono then? soundt/confused-smiley-013.gif If it's push-pull, I'm wondering where the other two output tubes are?

That's a very nice looking amp. soundt/thumbup.gif

John

Good grief,

Of course it´s gotta be a SE. soundt/banana.gif soundt/banana.gif soundt/banana.gif
How stupid can one be? sad.gif blink.gif blink.gif

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
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GordonW
Posted: March 03, 2007 07:12 am
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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.


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hifi_nut
Posted: March 03, 2007 07:58 am
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QUOTE (GordonW @ March 03, 2007 02:12 pm)
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. soundt/thumbup.gif

Gosh, I feel small, and so, oh so, ignorant sad.gif

Jorge

This post has been edited by clint e. on March 06, 2007 04:47 pm
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