Re: [Drakelist] Nastiest Drake Gear

Looks like it has been washedin hurricane flood waters. 73, Ron WD8SBB --- On Wed, 12/21/11, John Hudson john.hud...@calema.ca.gov wrote: From: John Hudson john.hud...@calema.ca.gov Subject: Re: [Drakelist] Nastiest Drake Gear To: John Brown brown...@optusnet.com.au, 'Steve Wedge'

Re: [Drakelist] Nastiest Drake Gear

I like the real slow crush from a concrete compression test machineI think Letterman did a bowling ball once that then exploded. Pretty cool. Curt..the other Curt KU8L On 12/21/2011 9:10 PM, Mark Nace wrote: This is a bad thought, but we have all seen the big crushers for wrecked cars.

Re: [Drakelist] Nastiest Drake Gear

In a message dated 12/21/2011 11:48:39 P.M. Eastern Standard Time, w...@roadrunner.com writes: First remove the crystals. They occasionally fail and are needed. Wailll, I think the PTO should come out of there too, and then of course someone will say the relay, and oh yeah the light bulb

Re: [Drakelist] AC-4R Surprise

True. I've seen 3-500Z's die that way, too, but that failure is usually a lot more exciting! You won't find a short with the ohmmeter, but you'll get a nice bang when you put the 3kV to the plate :) Steve, W1ES/4 -Original Message- From: Garey Barrell k4...@mindspring.com Sent: Dec

Re: [Drakelist] T4XB Front Panel

I've got an extra one, but you know it has that same darned hole in it ;-) Steve, W1ES/4 -Original Message- From: Pete Juliano Sent: Dec 21, 2011 11:49 PM To: Drakelist@zerobeat.net Subject: [Drakelist] T4XB Front Panel Does any one happen to have a T4XB

Re: [Drakelist] Nastiest Drake

Hi All, Well I see that upay has it at $20, someone wanted for parts. If it was at a ham flea market I'd probably be idiotic enough to buy it for that too, but darned if I would pay 2x , shipping on top. Carl wd8nhk___ Drakelist mailing list

Re: [Drakelist] AC-4R Surprise

Does the glass envelope actually break? 73, Lee -Original Message- From: Steve Wedge w1es1...@earthlink.net To: k4oah k4...@mindspring.com Cc: Drakelist Drakelist@zerobeat.net Sent: Thu, Dec 22, 2011 8:42 am Subject: Re: [Drakelist] AC-4R Surprise True. I've seen 3-500Z's die that

Re: [Drakelist] AC-4R Surprise

No, but all such failures I'd seen were in Heathkit SB-220's. When the short occurs, it causes immediate and catastrophic flameage of the grid RF choke. Because those chokes usually have some sort of waxy coating, they make nice candles :) The smoke will fill the room quickly. -Original

[Drakelist] Speaking of breaking Glass...

I witnessed something recently that In nearly 50 years of working with tube rigs, I had never seen. I was working on an older hybrid rig with 6JS6's in it. Had a known good set of finals and was getting unit ready to ship to a new owner. Powered it on the bench and all was good..did a cold

Re: [Drakelist] Speaking of breaking Glass...

On 2011-12-22, at 12:54 PM, Curt wrote: All looks ok EXCEPT..the one tube that was bright has a small suck-hole thru the side of it. It got so hot, the glass melted and a hole was sucked thru the side without breaking the rest of the tube. YIKES Hi Curt, That happened to me one time

Re: [Drakelist] Speaking of breaking Glass...

- Original Message - From: Eddy Swynar deswy...@xplornet.ca To: Curt cptc...@flash.net Cc: drakelist@zerobeat.net Sent: Thursday, December 22, 2011 10:08 AM Subject: Re: [Drakelist] Speaking of breaking Glass... On 2011-12-22, at 12:54 PM, Curt wrote: All looks ok EXCEPT..the one

Re: [Drakelist] AC-4R Surprise

All, Well my luck or lack thereof continues... I pulled the 6HS6 and then referenced my Eico 625. Of course the 6HS6 isn't mentioned anywhere in any of the charts I have. So, based on some results of a search, tested it as a 6AU6 and then a 6HR6. Former showed good, latter showed marginal,

Re: [Drakelist] Speaking of breaking Glass...

Couldn't have happened to something with 6146's - would have not been expensive enough ;-) At least you found it. That's when stuff starts getting expensive. A lot of times, when an SB-220 would get a parasitic, that grid choke would get zorched. By the time that choke opened up, the grid

Re: [Drakelist] Speaking of breaking Glass...

Have never experienced this and hope I never do. These sweep tubes are getting too precious. 3-500's have much thicker glass than even 811A's, so I don't think it would be very easy to get a suck-out on one of those puppies. I have seen the grid get shorted to the plate - usually as a result

Re: [Drakelist] AC-4R Surprise

I still believe that R61 and the AC-4 were both victims of the same failure. And I still would not trust that 6HS6. Did you recheck the resistances with the 6HS6 removed? 73, Bob WW3QB All, Well my luck or lack thereof continues...  I pulled the 6HS6 and

Re: [Drakelist] AC-4R Surprise

I think Garey had mentioned you can fry the plate resistor on V8 if you short one of the trimmer caps while tuning it. It's still odd to me to have a resistor fail shorted. The 6HS6 will have the same switch settings as a 6AU6 but it has quite a bit more gain and a different bias setting.

Re: [Drakelist] AC-4R Surprise

I think Garey had mentioned you can fry the plate resistor on V8 if you short one of the trimmer caps while tuning it. It's still odd to me to have a resistor fail shorted. The 6HS6 will have the same switch settings as a 6AU6 but it has quite a bit more gain and a different bias setting.

Re: [Drakelist] AC-4R Surprise

Steve - The resistor in question is a 150 ohm decoupling resistor, not a plate load resistor. It's not all that unusual for the low value carbon comps to fail shorted. Enough current to melt the binder into a lump of coal ('tis the Season) rather than enough to just vaporize it! Also an

Re: [Drakelist] AC-4R Surprise

I've checked all of the tubes with my old emission tester, all test good except for the OA2 which lights up but tests bad. Not sure how valid that is. And with V8 removed, the resistance at pin 6 is still 15k rather than 90k per the manual. I'm in process of resistance checking the rest of the

Re: [Drakelist] AC-4R Surprise

At 55, I still learn stuff. I consider that to be cool. Garey, I'd be willing to bet you've worked on a lot more tube gear than I have, so this will go into my mental filing cabinet as a failure mode. Caps I've seen fail shorted; diodes and transistors, too. Given what you've said about an

Re: [Drakelist] TX-4C 160 Mod ?

I've also had some questions about the FS4 project of this page.  I actually had good fortune to find and e-mail Mr Robert Stein.  Although I cannot locate the e-mails, I recall mentioning two issues with the project.  First issue is critical parts no longer available and no good subs.  Second

[Drakelist] 2 Pin Plugs

Hi and happy holidays, I need to find the 2 pin plugs that are used off the power supplies for keying an amp like a L-4B. Any ides?? Thanks, Pat,W7EHM ___ Drakelist mailing list Drakelist@zerobeat.net

Re: [Drakelist] AC-4R Surprise

Curt - The 0A2 is always difficult to test, as most inexpensive testers don't have enough high voltage DC to fire. As I said earlier, I think you have a problem with your Pin 6 of V8 resistance measurement. There is a 6.8k and 6k resistor in series between that pin and the +250 bus.

Re: [Drakelist] 2 Pin Plugs

On Thu, 22 Dec 2011 18:29:52 -0700, Patrick Jones wrote: Hi and happy holidays, I need to find the 2 pin plugs that are used off the power supplies for keying an amp like a L-4B. Any ides?? Discussed lots in the past: http://www.mail-archive.com/search?q=vox+plugl=drakelist%40zerobeat.net 73

Re: [Drakelist] Speaking of breaking Glass...

On Thu, 22 Dec 2011 12:54:59 -0500, Curt wrote: It got so hot, the glass melted and a hole was sucked thru the side without breaking the rest of the tube. I saw something similar years ago in a sweep that was pulled from one of those horribly designed 11-Meter amps. The glass had been sucked