Worldwide DX Amateur Radio Forums - Ham - CB - HF - VHF - UHF

Drifter · #11 10-30-2009, 06:18 PM

Quote:

Originally Posted by bigred222

you gonan run that into the 3000a7 you got?

no... thats too much drive.

W5LZ · #12 10-30-2009, 06:23 PM

Oh, I wouldn't worry much about over driving things. Unless that '220 is very heavily modified, as in redesigning it from the ground up, you certainly aren't getting that much power out of it on AM (or is that input power?

).
- 'Doc

Drifter · #13 10-31-2009, 02:29 AM

Quote:

Originally Posted by W5LZ

Oh, I wouldn't worry much about over driving things. Unless that '220 is very heavily modified, as in redesigning it from the ground up, you certainly aren't getting that much power out of it on AM (or is that input power?

).
- 'Doc

Soooo Doc You are saying I can get away with driving the 3cx3000 amp with the SB-220? Actually when I think about it... it should work

Just have to monitor my drive levels..

W5LZ · #14 10-31-2009, 05:32 AM

Drifter,
Do I think you can get away with driving that 3CX3000 with your claimed output from that '220?
Before I answer that, let me say this. I have made a very basic mistake by not going back and re-reading this thread. I am making an assumption about that SB-220 that I haven't confirmed, that it has not been modified very extensively to be getting almost three times the power out of it as a 'normal' SB-220. Or would that be four times the power, or even greater because of the way power was figured at the time that thing was designed? I'm also making an assumption from just the name of the tube's brand and my prior experience with them, that I shouldn't make. Things can change over time because of improvements in manufacturing and i didn't take that into accounting for your results. (I'm also not taking into account the moronic habit of people 'mixing' power measurement units for misguided reasons. Or should that actually be "more-out-ic" instead of moronic habit?)
So actually what I'm doing here is making a very embarrassing apology for making assumptions I shouldn't have. I'm also apologizing for not rectifying that mistake by re-reading this thread completely. I find I'm just not interested enough.
Now, having gone through all that, before answering you last question. Here's my answer...
I think I'd take a good look at that 3CX3000's input ratings, and the metered values from the front panel of that SB-220 (making another unsubstantiated assumption there) before mating the two.
- 'Doc

555 · #15 10-31-2009, 09:17 AM

can i use a sb220 stock to drive a 5 tube heathkit 5-3-500zg

Drifter · #16 10-31-2009, 11:47 AM

Quote:

Originally Posted by W5LZ

Drifter,
Do I think you can get away with driving that 3CX3000 with your claimed output from that '220?
Before I answer that, let me say this. I have made a very basic mistake by not going back and re-reading this thread. I am making an assumption about that SB-220 that I haven't confirmed, that it has not been modified very extensively to be getting almost three times the power out of it as a 'normal' SB-220. Or would that be four times the power, or even greater because of the way power was figured at the time that thing was designed? I'm also making an assumption from just the name of the tube's brand and my prior experience with them, that I shouldn't make. Things can change over time because of improvements in manufacturing and i didn't take that into accounting for your results. (I'm also not taking into account the moronic habit of people 'mixing' power measurement units for misguided reasons. Or should that actually be "more-out-ic" instead of moronic habit?)
So actually what I'm doing here is making a very embarrassing apology for making assumptions I shouldn't have. I'm also apologizing for not rectifying that mistake by re-reading this thread completely. I find I'm just not interested enough.
Now, having gone through all that, before answering you last question. Here's my answer...
I think I'd take a good look at that 3CX3000's input ratings, and the metered values from the front panel of that SB-220 (making another unsubstantiated assumption there) before mating the two.
- 'Doc

No worries... Thanks for the clarification.

W5LZ · #17 10-31-2009, 04:40 PM

555,
Yes, if you throttle it back to almost nothing. As in disabling the final in the radio and only using the driver stage.
- 'Doc

But for some reason, I think you already knew that...

555 · #18 11-01-2009, 09:26 AM

Quote:

Originally Posted by QRN

Eimac does not make any new glass tubes any more. With the gas leakage problem they had with the 3-500's I don't know if I would want to spend my $$$ on a NOS set and risk them arcing on the first try. There have been MANY cases of just that happening with the Eimacs.

i called rfparts saturday and asked if they had some Eimacs in the 3-500zg
he said they still had some in stock
how many would you like

HiDef · #19 11-01-2009, 10:44 AM

Quote:

Originally Posted by QRN

Eimac does not make any With the gas leakage problem they had with the 3-500's I don't know if I would want to spend my $$$ on a NOS set and risk them arcing on the first try. There have been MANY cases of just that happening with the Eimacs.

Funny how old 3-500Zs are traded almost every week on ebay and the feedback looks good.

Methinks most of this gas leakage stuff is a couple of individuals bouncing B.S. back and fourth across the internet mixed in with a sprinkle of fact. When you start asking these gurus questions they usually stop dead in their tracks.

Eimac probably had a few years of quality control problems. Plenty of users of these tOObs never knew that they are supposed to be run with color either. Lots of guys rocked the tOObs out of their sockets.

I saw one new ham actually shake a 3-500Z to "test" it. Kinda ended up like a witch burning at the stake.

SR385 · #20 11-01-2009, 11:00 AM

The Taylors from RF Parts have a good rep from anything I've heard. They match them well when you buy a matched set and they stand behind them if they do turn out to have a legitimate defect from anything I've seen.

Great thing with the 3-500ZG, it can take a pounding. Very forgiving and why I went AL-80B when I bought an amp finally.