What is the probable output of an amp using a pair of Eimac 4 x 150 a / 7034 tubes on 6M? -- *David* ~KD4E~ Nevils, Georgia USA Safe & Secure Search Engine: duckduckgo.com Android for Hams: groups.ya
What screen voltage? What mode? CW? SSB? See: http://www.g8wrb.org/data/Eimac/4X150A_D.pdf for data sheet. 73, George T Daughters, K6GT CU in the California QSO Party (CQP) October 3-4, 2015 _______
Guess at 2X the plate dissipation (Max)... 2 X300 = 600. Build it so, later, you can plug in 4x250's or 350's. _______________________________________________ Amps mailing list Amps@contesting.com ht
The 4X150A/7034 name tricks you into thinking they are 150 watts plate dissipation. Actually, it is 250 watts. Colin K7FM _______________________________________________ Amps mailing list Amps@conte
EIMAC 4X150A/7034 have same specifications as a 4CX250B. The characteristic curves are identical. The only real difference is that the insulator between plate and screen ring is glass and not ceramic
600W PEP on SSB with poor to fair IMD, any more and it gets real bad. Screen and grid voltage regulation is very important. They are a late 1940's design prior to SSB popularity. Carl KM1H What is th
There are glass upper and base, glass base and ceramic upper and all ceramic 150A's. Only the all ceramic had the 250 ratings and more fins, Amperex had them marked 150A as well as 150A/7034.....same
The Eimac data sheet does not confirm that http://www.r-type.org/pdfs/4x150a.pdf The RCA 4X150A/7034 data does: http://pdf1.alldatasheet.com/datasheet-pdf/view/241849/ETC/7034-4X150A.html 73 Peter --
What is the probable output of an amp using a pair of Eimac 4 x 150 a / 7034 tubes on 6M? *David* ~KD4E~ Nevils, Georgia USA amp for 6m..or any other band ? Then toss in the regulated screen supply e
"The Eimac data sheet does not confirm that http://www.r-type.org/pdfs/4x150a.pdf The RCA 4X150A/7034 data does: http://pdf1.alldatasheet.com/datasheet-pdf/view/241849/ETC/7034-4X150A.html" The RCA d
The RCA data sheet attached is indeed for the 7034/4X150A tube and it does specify 250 watts plate dissipation. In my earlier post, I meant to say that the Eimac tube data is for the 4X150A, which i
He is asking about a PAIR of tubes in an amp he is looking at. One option there is that other tubes in the 4X150/250 family can be used that offer much better IMD For many a $700 Chinese 8877 is not
When the 4X150 was upgraded to the 4CX250 anode fins ( more fins and more restrictive air flow ) it's dissipation rating went to 250 watts. No internal changes. The upgraded 4X150 was only in product
I suspect when EIMAC came out with the 7034 they wanted to suggest that they were a good replacement for the 4X150A. Military particularly wanted to use the same part number when replacing tubes in t
Collins Radio changed the output tubes in the KWS-1 from the 4X150 to the 4X250B and there were enough differences that a service bulletin was required. They noted that the input capacitance decrease
I suspect when EIMAC came out with the 7034 they wanted to suggest that they were a good replacement for the 4X150A I once asked Bill Orr how much air would be sufficient for a quad of 250Bs. Orr lov
And, just to complicate things a bit, the 4CX250R is stated to provide more output than the 4CX250B. I think it is rated for repeater usage, although the bias and characteristics are different than t
More rugged screen and grid structure for high vibration ( read military ). Don W4DNR And, just to complicate things a bit, the 4CX250R is stated to provide more output than the 4CX250B. I think it i
Though the "R" was for "linear service"... Maybe more better IMD. Have some. Sent from my iPhone _______________________________________________ Amps mailing list Amps@contesting.com http://lists.con
HiJim & Carl Yes, Chinese 8877 is my option too.but in lower power level,for example 1000W,what is your option? a GU-74?or a pair GI-7B(GI-46B)?or a pair 3-500Z?I know pulse tubes with bad IMD specs.