RE: VTTC from Eimac 8755 on eBay

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Rich & DJ" <rdj@xxxxxxxxxxxx>

I have never used this tube but used the 2C39A , a little brother of
this tube. I think you need to take a look at the tube specs , I see
this as a low power < 150watt, hi freq, 3000Mhz tube.  Plate voltage
1750Vdc.
Do not confuse pulse voltage with operating voltage. The grid is only
rated at  1.5 watt.

        Rich , kd0zz

-----Original Message-----
From: Tesla list [mailto:tesla@xxxxxxxxxx]
Sent: Wednesday, January 31, 2007 10:48 PM
To: tesla@xxxxxxxxxx
Subject: VTTC from Eimac 8755 on eBay

Original poster: westland <westland@xxxxxx>

*I'd like some advice from the group on a VTTC ...

There is an Eimac 8755 RF Triode available on
eBay, which seems to me would work well as the
core of a reasonably powerful VTTC.   135
amplification, 3GHz max freq, Anode V 8Kv and Amp
7.5A ... apparently you can cool it with fluids,
so it seems you could make a pretty powerful circuit with it.
Would this be a good choice (with appropriate
power source ... suggestions?) and John Freau's Staccato controller?


Here are the **Eimac 8755 specs*

*Amplification Factor (µ):* 135.0
*Anode Current (A):* Maximum 5.0
*Anode Voltage (kV):* Maximum 10
*Brand:* Eimac
*Cooling Method:* Forced Air
*Filament Current (mA):* 1,300
*Filament Voltage (V):* 6.300
*Frequency (MHz) Maximum:* 3,000
*Peak Anode Voltage (kV):* 8.000
*Peak Cathode Current (A):* 7.500
*Transconductance (µmhos):* 30
*Typical Anode Current (mA):* 1,000
*Typical Anode Voltage (V):* 1,750
*Typical Grid 1 Voltage (V):* -100
*Typical Power Out (W):* 650

--
____________________________________________________

J. Christopher Westland, PhD CPA
Professor, ISMT, University of Science &
Technology, HK Clearwater Bay,Kowloon, Hong Kong
Tel: 852 2358 7643
Fax: 852 2358 2421
Mob: 852 9528 1745
URL: ihome.ust.hk/~westland
Mobile e-mail: chris.westland@xxxxxxxxxxxx