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I've been offered this job lot from a SK sale... I recognise 3CX15k, 4CX5k, Gu81m, ITL9-1, BR1106, Vac-Vars (10-200, 25kV) any idea's for the rest? There are some kanji characters on the big glass bulbs, so Japanese maybe ? 
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Just a thought¡perhaps putting the items on a white, non-patterned background, might make ±õ¶Ù¡¯¾±²Ô²µ them a might easier! ? Just sayin¡¯! ? Joe ¨C W7RKN ? From: [email protected] [mailto:[email protected]] On Behalf Of Tim Fern
Subject: [ham-amplifiers] Identifying some rare tubes... ? I've been offered this job lot from a SK sale...
I recognise 3CX15k, 4CX5k, Gu81m, ITL9-1, BR1106, Vac-Vars (10-200, 25kV) any idea's for the rest?
There are some kanji characters on the big glass bulbs, so Japanese maybe
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I agree. The pattern on the background makes it a little confusing.
On Saturday, February 24, 2024 at 11:52:41 AM EST, Joe - W7RKN <w7rkn.7@...> wrote:
Just a thought¡perhaps putting the items on a white, non-patterned background, might make ±õ¶Ù¡¯¾±²Ô²µ them a might easier! ? Just sayin¡¯! ? Joe ¨C W7RKN ? From: [email protected] [mailto:[email protected]] On Behalf Of Tim Fern
Subject: [ham-amplifiers] Identifying some rare tubes... ? I've been offered this job lot from a SK sale...
I recognise 3CX15k, 4CX5k, Gu81m, ITL9-1, BR1106, Vac-Vars (10-200, 25kV) any idea's for the rest?
There are some kanji characters on the big glass bulbs, so Japanese maybe
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Indeed, but sadly the only other pictures I have:    Looks like this? (reading backwards through the glass) is a 6T51? Designed as an industrial heater oscillator triode.? Not sure it would be much use for anyone here?
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Strange. On the link you sent on one photo it shows the 6T51 as a glass tube but on another photo it shows it as an external anode. Even on evilbay they show a 6T51 as an external anode as a FU-605. ? Mod-U-Lator, Mike(y)/W3SLK ? ? ?
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From: [email protected] [mailto:[email protected]] On Behalf Of Tim Fern
Sent: Saturday, February 24, 2024 4:19 PM
To: [email protected]
Subject: Re: [ham-amplifiers] Identifying some rare tubes... ? Indeed, but sadly the only other pictures I have:
  
Looks like this? (reading backwards through the glass) is a 6T51?
Designed as an industrial heater oscillator triode.? Not sure it would be much use for anyone here?
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Regardless, with just one unknown-condition example of either,
you'd be foolhardy to design anything around one...
Steve, K0XP
On 2/24/2024 2:29 PM, Mike Sawyer via
groups.io wrote:
Strange. On the link you sent on
one photo it shows the 6T51 as a glass tube but on another
photo it shows it as an external anode. Even on evilbay
they show a 6T51 as an external anode as a FU-605.
?
Mod-U-Lator,
Mike(y)/W3SLK
?
?
?
From:
[email protected] [mailto:[email protected]]
On Behalf Of Tim
Fern
Sent:
Saturday, February 24, 2024 4:19 PM
To:
[email protected]
Subject: Re:
[ham-amplifiers] Identifying some rare tubes...
?
Indeed, but sadly the only other
pictures I have:
  
Looks like this? (reading backwards through the glass) is
a 6T51?
Designed as an industrial heater oscillator triode.? Not
sure it would be much use for anyone here?
--
See my QRZ.com page at
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On Sat, Feb 24, 2024 at 11:40 PM, Steve wrote:
>Regardless, with just one unknown-condition example of either, you'd be foolhardy to design anything around one...
>Steve, K0XP
Agreed,? Don't start any amp project, unless you have at LEAST TWO known good tubes.? ? And don't build any amp with more than one tube....pita.? ?You will have a helluva time trying to play...'match up'.??
That 3x15 triode with the flex leads is the H3 version.? ?Those are low mu...and useless? for cathode driven / GG amplifier service.? ?However, it can be rebuilt? by econco, and they will replace the grid with a high mu grid. It's done all the time.? Then it becomes the ultimate tube, since no socket required.? ?Just bolt the grid flange to the chassis.? Apply 1.5 kw of drive....and blast away with 30 kw pep out.? As a bonus, you can heat the home in winter, with...'free heat'.
?
We have the fil choke for those 160 amp and lower down to a fine art.? It's just a simple matter of sliding a mess of fair-rite type 43 oval beads over a pair of 1-0 power cables....done..... in abt 20 secs flat.?
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On 2/25/2024 10:52 AM, Jim VE7RF wrote: Agreed,? Don't start any amp project, unless you have at LEAST TWO
known good tubes.? ? And don't build any amp with more than one
tube....pita.? ?You will have a helluva time trying to play...'match up'. It's kinda hard to fit a 3x3 into a desktop cabinet.
As a bonus, you can heat the home in winter, with...'free heat'.
... with a high 3-digit, maybe low 4-digit electric bill...
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Agreed, Don't start any amp project, unless you have at LEAST TWO
known good tubes. And don't build any amp with more than one
tube....pita. You will have a helluva time trying to play...'match up'.
It's kinda hard to fit a 3x3 into a desktop cabinet.
Good point jim.
Also not good practice to build a pa around a tube that is near unobtanium.
As for fitting a 3000 in a desk top cabinet, just make the plate supply separate and stick it under the desk. Presto Piece of cake.
But the real question is why would you want a noisy pa in the same room with you.
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On 2024-02-25 13:40, Steve wrote: On 2/25/2024 10:52 AM, Jim VE7RF wrote:
Agreed,? Don't start any amp project, unless you have at LEAST TWO
known good tubes.? ? And don't build any amp with more than one
tube....pita.? ?You will have a helluva time trying to play...'match up'. It's kinda hard to fit a 3x3 into a desktop cabinet.
As a bonus, you can heat the home in winter, with...'free heat'.
... with a high 3-digit, maybe low 4-digit electric bill...
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"rebuilt? by econco, and they will replace the grid with a high mu grid"?I suppose that is only possible with the 3X15 because a hi mu grid component is available? Does anyone know the cost of a 3CX10/15 rebuild $?? ballpark, I've never done it.
A couple of those tubes with flex leads are Thales ITL9-1's (low mu oscillator tubes) I guess there is unlikely to be a hi mu grid for them :-(
https://soudeuse-haute-frequence.com/nos_produits/triode/ITL9-1.pdf
Tim
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On 2/25/2024 1:28 PM, Amp Guy Llc wrote: But the real question is why would you want a noisy pa in the same
room with you. Because you wear headphones, and external noise doesn't bother you??
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WB4VVI(SK) always told me when building/designing a transmitter or amp to use a tube that was pretty flat emission wise. No sense in screwing up a good tube on a miss-wired endeavor and/or a parasitic that may have unwittingly found itself into the construction!
Mod-U-Lator,
Mike(y)/W3SLK
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-----Original Message----- From: [email protected] [mailto: [email protected]] On Behalf Of Amp Guy Llc Sent: Sunday, February 25, 2024 4:28 PM To: [email protected]Subject: Re: [ham-amplifiers] Identifying some rare tubes... Agreed, Don't start any amp project, unless you have at LEAST TWO known good tubes. And don't build any amp with more than one tube....pita. You will have a helluva time trying to play...'match up'. It's kinda hard to fit a 3x3 into a desktop cabinet. Good point jim. Also not good practice to build a pa around a tube that is near unobtanium. As for fitting a 3000 in a desk top cabinet, just make the plate supply separate and stick it under the desk. Presto Piece of cake. But the real question is why would you want a noisy pa in the same room with you. On 2024-02-25 13:40, Steve wrote: On 2/25/2024 10:52 AM, Jim VE7RF wrote:
Agreed, Don't start any amp project, unless you have at LEAST TWO
known good tubes. And don't build any amp with more than one
tube....pita. You will have a helluva time trying to play...'match
up'. It's kinda hard to fit a 3x3 into a desktop cabinet.
As a bonus, you can heat the home in winter, with...'free heat'.
... with a high 3-digit, maybe low 4-digit electric bill...
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Steve nobody puts a 3x3 or any other big tube into a desktop unit.? ?They all go into a standard 19"/ 24" rack.? Typ the blower hangs below the bottom of the chassis.? ?Putting a 100 lb box on a desk is nuts.?
My racks all sit in the shop next door.... 4 in total...all in a row.??
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Yes they will convert to a hi mu
Price last time I asked was roughly 2400 minus shipping to rebuild a 3cx15k . Not sure on the 3cx10k
Econco changed their warranty , now 1 year / 3000 filament hours whichever comes first.
Used to be 3000 hr filament and no limit on time to achieve.
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Headphones yeah I almost said that , but one of the main reasons a pa comes in for repair. Person has an open on the output , way outa tune or sone sort of other issue and they don¡¯t hear a component arcing away. In a standard multi pa usually ends up being the plate tune air variable cap and or the band switch.
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On 2024-02-25 15:51, Steve wrote: On 2/25/2024 1:28 PM, Amp Guy Llc wrote:
But the real question is why would you want a noisy pa in the same
room with you. Because you wear headphones, and external noise doesn't bother you??
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