common with sweep tubes, I think some with 4x150's, and 6146's. Other than the added sockets and wiring complexity are there additional down-sides to such a design? e.g. Eight 6146's should generate
It becomes a lot more complex when you start adding tubes. Power supplies, in particular HV and Filament require high current capability, tank circuits become more complex because of the change in lo
I guess a 813 or 4-125 is cheaper 73 Peter common with sweep tubes, I think some with 4x150's, and 6146's. Other than the added sockets and wiring complexity are there additional down-sides to such a
Filament require high current capability, tank circuits become more complex because of the change in load impedance, Filament current requirements are generally proportional to the peak current capab
-- ORIGINAL MESSAGE --(may be snipped) REPLY: Please explain how tank circuits become more complex with changes in load impedance. Bill W6WRT _______________________________________________ Amps mail
The design needs to take into consideration the characteristics of the tube(s) and allow for such, In the case of the Emtron DX-2so ans DX-3sp the bias is set for each tube individually. The closer t
OK, I've received the education I anticipated, thanks! Price comparison for a true 600w output 160-10m linear amp: 813 $90. new, $45 - $50. each used, tested good. x 2 = $90. - $180. tube cost. 6146
It becomes a lot more complex when you start adding tubes. Power supplies, in particular HV Like 800-900 volts @ 1 amp. ( and eight 1646s might not hit 15 meters ) Don W4DNR ________________________
-- ORIGINAL MESSAGE --(may be snipped) REPLY: That problem of excessive output capacitance was solved long ago. Consult any recent ARRL Handbook in the amplifiers section. Look for info about an L-ne
My preference is the 4-125A, They sell new on ebay from $6 to $20. They are not in much demand because there is very little old or surplus equipment out there that use them, unlike the 813,but there
Oh, I forgot the 6155 which is a variation of the 4-125A. It is a bit more rugged. 73 Bill wa4lav My preference is the 4-125A, They sell new on ebay from $6 to $20. They are not in much demand becaus
On 1/19/2015 8:25 PM, Fuqua, Bill L wrote: My preference is the 4-125A, The 4-125A is interesting as an inexpensive tube. The data I have using the tube in grounded grid operation is from the $2.50 c
I remember the WRL Galaxy 2000 had 10 sweep tubes in it. That was quite a beast :-) 73 Tom W7WHY ( and eight 1646s might not hit 15 meters ) Don W4DNR REPLY: That problem of excessive output capacita
I bet you have a much better chance of getting two matching 4-125A tubes than 10 sweep tubes. Hi Hi Hi ________________________________________ From: Amps [amps-bounces@contesting.com] on behalf of T
-- ORIGINAL MESSAGE --(may be snipped) REPLY: That problem of excessive output capacitance was solved long ago. Consult any recent ARRL Handbook in the amplifiers section. Look for info about an L-ne
But in "those days" they didn't worry about matching tube in a lot of amp, or IM for that matter. On one hand we had the 32S* series and KWM-2 at 50 db IM or less, while on the other we had 19 sweep
IF I recall correctly, the WRL2000 plate impedance was 1000v/2amps or 50 ohms. Don W4DNR I bet you have a much better chance of getting two matching 4-125A tubes than 10 sweep tubes. Hi Hi Hi _______
No to all. I used cathode resistors 10 Ohm with all my multi parallel sweep tubes in the past like 14x PL36, 6x PL519, 6x 6DK6 etc. and just a single amp meter and bias pot. Also had 2x12 PL519 push
With an anode current of 2A at 1KV the output impedance will be around 250 ohms. 73 Peter --Original Message-- From: Amps [mailto:amps-bounces@contesting.com] On Behalf Of donroden@hiwaay.net Sent: D
Bill wrote... < snip > Or, you could just contact me. I have a pair of 4-125A's I'd part with for a reasonable sum. Filaments and hi-pot test good. I also have a pair of 4-250A's... Filaments and hi-