>
>Tom:
>
>Our problem with those Russian tubes is, that very little if ever seems to
>have been published of how linear they are in SSB? Nothing about distorsion
>like in the EIMAC publications. Those surplus tubes from the miltary must be
>of high quality and reliability as much money and effort was put into this
>according to Russian hams on the bands.
>
>One important question is, why they did not they make copies of the
>excellent 88 family (8877, 8874 etc)
G-G is not very suitable for a 9-band amplifier. Tetrodes and Pentodes
in AB1 are.
>and why did not the proposed 3-600Z
>come out from Svetlana?
>
The 3-600 is a scam. The cathode has the same emission as a 3-400Z/8163
or a 3-500Z/8008. The SSB-pep is the same. Except on RTTY, there is no
advantage.
end
>Lets here your answer on that Tom?
>----------
>>Från: w4th@webtv.net (Tom Hix W4TH)
>>Till: amps@contesting.com
>>Kopia: rexjo@bellsouth.net
>>Ämne: [AMPS] possible amp tube
>>Datum: lör 18 nov 2000 07.12
>>
>
>>
>>Will the guys that are into building amateur pa amps please take a look
>>at the specs for this big Russian tube, and see what you think the
>>prospects would be for building an amp with this tube. This thing is
>>about a foot high, and about the size in diameter of a pound coffee can.
>>Here is a pix.
>>http://www.tubes.lt/gif/gu-81m.gif
>>And here are the specs.
>>==================================
>>The GU-81M pentode is used in self-excited oscillation and power
>>amplification circuits of RF equipment.
>>GENERAL
>>Cathode: directly heated, carbonized thoriated tungsten.
>>Envelope: glass, with base.
>>Height: at most 260 mm.
>>Diameter: at most 202 mm.
>>Mass: at most 1 kg.
>>OPERATING ENVIRONMENTAL CONDITIONS
>>Ambient temperature, °C -10 to+ 55
>>Relative humidity at up to +25 °C, % 98
>>BASIC DATA Electrical Parameters
>>Filament voltage, V 12.6
>>Filament current, A, at most 11
>>Mutual conductance (at anode voltage 2 kV, grid 2
>>voltage 600 V, anode current 200 mA), mA/ V 4.5-6.5
>>Gain coefficient (grid 1 -grid 2) (at anode voltage 2 kV,
>>grid 2 voltages 600 and 500 V, anode current 200 mA) 2.5-4
>>Bias voltage (at anode voltage 2 kV, grid 2
>>voltage 600 V), V 116-160
>>Interelectrode capacitance, pF:
>>input 25-32
>>output 21-26
>>grid 1-anode, at most 0.1
>>grid 1-grid3 1-4
>>Output power (at anode voltage 2 kV, grid 2
>>voltage 600 V, bias voltage -200 V, grid 1 drive voltage
>>amplitude 300 V, anode current, at least 450 mA,
>>grid 1 current at most 20 mA, grid 2 current,
>>at most 220 mA), W, at least 700
>>Limit Operating Values
>>Filament voltage, V 11.6-13.4
>>Anode voltage, V:
>>at frequencies not above 6 MHz 3
>>at frequencies not above 24 MHz 2.5
>>at frequencies not above 50 MHz 1.5
>>Grid 2 voltage, V 600
>>Anode current (average value), A 0.6
>>Grid 1 current (average value), A 0.02
>>Grid 2 current (average value), A 0.2
>>Dissipation, W:
>>anode 450
>>anode (momentary dissipation) 600
>>grid 2 120
>>grid 1 10
>>Envelope temperature, °C 350
>>PENTODE GU-81M
>>CONNECTION
>>OF ELECTRODES
>>WITH LEADS
>>1, 2 -cathode; 3 -grid 1;
>>4 -grid 2; 5 -cathode centre tap;
>>6, C3 -grid 3; A -anode
>>
>>===================================
>>Be sure to visit my web sites.
>>Tom's Tubes, Svetlana Amateur Radio Amp Tubes.
>>http://msnhomepages.talkcity.com/ClassifiedsCt/tomstubes/index.html
>>
>>Ham Radio Homepage.
>>http://www.geocities.com/bamagramps/
>>
>>
>>--
>>FAQ on WWW: http://www.contesting.com/FAQ/amps
>>Submissions: amps@contesting.com
>>Administrative requests: amps-REQUEST@contesting.com
>>Problems: owner-amps@contesting.com
>>
>>
>
>--
>FAQ on WWW: http://www.contesting.com/FAQ/amps
>Submissions: amps@contesting.com
>Administrative requests: amps-REQUEST@contesting.com
>Problems: owner-amps@contesting.com
>
>
- Rich..., 805.386.3734, www.vcnet.com/measures.
end
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