Ok I am going to have a custom Amp built. I would like some input about tubes. I am looking at the GS-35B or the 3CX1500A7 tubes. Which of the two is best for 10 - 12 meters, and make a better running linearamplifier?
TIA
TIA
-
You can now help support WorldwideDX when you shop on Amazon at no additional cost to you! Simply follow this Shop on Amazon link first and a portion of any purchase is sent to WorldwideDX to help with site costs.
Which is better??
- Thread starter Drifter
- Start date
hey paws,
what is the purpose of those resistors soldered to the copper strapping?
ive not seen that before and im very curious to learn.
thanks,
LC
what is the purpose of those resistors soldered to the copper strapping?
ive not seen that before and im very curious to learn.
thanks,
LC
loosecannon,
Those appear to be parasitic suppression resistors on the plate connections. Only going by the picture, if that's typical of the amplifier you want, I'd suggest passing on them. As it is, it is NOT well designed at all, in my opinion.
- 'Doc
Those appear to be parasitic suppression resistors on the plate connections. Only going by the picture, if that's typical of the amplifier you want, I'd suggest passing on them. As it is, it is NOT well designed at all, in my opinion.
- 'Doc
They are not hard to get, go to eBay and buy them up, they are cheap enough for what then can do.
.
The GS35B is availabe for about 160 delivered. I have one I intend to put in an amp myself. Tube is a rugged military tube. Will do an honest 2500 out if you want. I am using an older BTI LK 2000 chassis and building the power supply myself. Looking at 3000volts at one amp. 3000 watts input for 1850 out. That way at legal limit ,I have some headroom.
Rich
Rich
May I make a suggestion? Try going with the 3cx1200A7. The tube is much more rugged, and if you're going to be using it on 10-11 meters, especially if you're going to run AM at all, the tube will hold up much better, and not be as prone to be sensitive to abuse due to the grid ratings.
The price of an 1200A7 tube makes that a bad choice to build around. The YC-156 is a great idea but the GS35b is the way to go.
there is no 1200A7 . com or 8877 . com but, there is a
GS-35B GS35B Russian Triode Tube,Socket and Teflon Chimney - Linear Amp Project - HF, VHF, UHF Amplifier - W4ZT
.
ive been in this hobby wayyyyyyyyyyyy to long. trust me use the 3x1200a7.
i dont like russian tubes because they are unpredictable and wil be rare soon.
ps. and do not ever buy used tubes on ebay . thats like buying used bird slugs.
i dont like russian tubes because they are unpredictable and wil be rare soon.
ps. and do not ever buy used tubes on ebay . thats like buying used bird slugs.
Yes, and I have been in this Business long enough and have the sufficient experience to offer an informed opinion about an electron tube that I am currently using. Certainly, you value your opinion but, the GS-35b which is made in Russia will work as well a tube made in the US.
The GS-35b is not unpredictable, it is a vacuum tube with operating guide lines; it is a stable medium-gain triode that does not "Take off". I have had 4500 volts on mine with no problems. To me, the word "unpredictable" translates to "lack of experience with product".
About the tubes being rare soon: Look at your World Map, Russia is a pretty big place and they have a lot of electronic gear which is going to be running for quite some time. What are you thinking, that the whole of eastern Europe and western Asia is suddenly going to convert all their tranmitters to Varian-Eimac products? Please!
Correct and, don't by used computer memory either but, Surplus GS-35b tubes are a good value and they will do 2500-plus watts each but, YMMV.
Don't take my word for it, go to:
GS35b.com
.
BTW: I know it's upside down, it is an editorial statement.
.
Last edited:
- No one is chatting at the moment.
-
-
dxBot:63Sprint has left the room.
-
dxBot:kennyjames 0151 has left the room.
-
-
