Well, since you don't have a pair of each, look at the price they go for on ebay what you want, to sell them and use the money to buy, say, output transformers for your other project, or buy one of each to get pairs and build an amp. However, it won't be easy to build an amp with either of them, but more so with the 250TH.
thanks. could you gimme a link?
Uh actually I got more than 10 pairs of every one of them.
thanks buddy but "right back at you" about your suggestion😉😛 I got more than 20 pieces of 100th and 250th. just whistle if you need one
I'm also genuinely interested in building an amp with these tubes. I've been designing amps using old transmitter tubes for a couple years now and find them to be utterly fascinating. ARIYAHOOR, I sent you a PM as well.
SK
You're overseas from North America?
I'd not ship them far, the filaments are fragile.
Best used for ham radio, imo. 😀
But if ur in the USA, or North America, I'm interested... 😀
_-_-bear
I'd not ship them far, the filaments are fragile.
Best used for ham radio, imo. 😀
But if ur in the USA, or North America, I'm interested... 😀
_-_-bear
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Joined 2009
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I would imagine that once they get shipped off they're gonna bounce around in a truck, a plane or whatever - matters not whether they are going 50 miles or 5000 miles. And in this case they would be coming from Iran.
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I'm still not sure why people always ask me for links when this information is just a one second internet search away?? Anyway...
Go to: groups.yahoo.com and then in the search dialog type GM70, and it will send you here: Yahoo! Groups: Search Results
You have to join, to do so click "Join this group" fill out the requested information, and then you will have to wait for the group owner to approve your application which could take a few days or more.
Hopefully this resource is not blocked in your neck of the woods.
Well Dang!!! I wish I never saw this thread. I've taken a break from audio due to life issue for a two years, but now all is well and I am back at it.....hard!
Yesterday I pulled out my GM70 project and started looking at what I needed to do to finish it. I've been poking away at this amp for the better part of 5 years and the whole time I've been going back and forth about using the GM70 or the 100TH. I landed on the GM70 but now..........
I think my schematic would allow me to drop in the 100TH by only changing the heater stuff.
Has anyone heard 100th SE amp???
Yesterday I pulled out my GM70 project and started looking at what I needed to do to finish it. I've been poking away at this amp for the better part of 5 years and the whole time I've been going back and forth about using the GM70 or the 100TH. I landed on the GM70 but now..........
I think my schematic would allow me to drop in the 100TH by only changing the heater stuff.
Has anyone heard 100th SE amp???
The late Jim Williams showed how to use one of these beasts in a voltage regulator:
An externally hosted image should be here but it was not working when we last tested it.
Problem is its high Rp (I measured 15k in a old amp I built) which makes 100TH just OK to drive other those big bottles that like to swing into A2. You'd better limit the operation of output tube to deep A1 and stay away from grid current. I ended up loading the 100TH with a CCS and used the mu-out
Meeehh ... my amp was initially a 100TH driving 304TL, tried 100TH and GM70 but I was liking 304TL more 😀 ... it was way too hot and was dismantled and reassembled as a direct coupled 801A-75TL
Schematic attached (note the missing bridges in the filaments supplies).
Attachments
What a beautiful amp. Gives me some inspiration for the several 304tl/th I have downstairs. Believe I also have some massive iron, at least for the PSU. Don't have an OPT though. How'd it sound?
304TL sounded terrific. 75TL is even better. Now this is the amp I ended with:
PSU: 866A into LLCLLC (separate for driver and power tube)
Filament: bridge into LLCLLCL
4 chassis
100kg
Note: LL stands for dual bobbins choke, one coil on + and one coil on -
PSU: 866A into LLCLLC (separate for driver and power tube)
Filament: bridge into LLCLLCL
4 chassis
100kg
Note: LL stands for dual bobbins choke, one coil on + and one coil on -
Attachments
on 10th Dec 2012 DIY a 211 Amp with vt25 or el34.
now 13th Dec Eimac Monster 250TH . very nice DIYer and nice job.
now 13th Dec Eimac Monster 250TH . very nice DIYer and nice job.
Uh you keep saying than nonsense as you're one of Hooman's right hand mans 😛
you'd better not mess with real DIYers here and be advised by me and go to your English class so you won't seem as a blah blah blah guy from slum block of tenement building of a third world who just can't simply digest a devastatingly piece a cake English sentence 😉
what have you done yourself? Uh humbly nothing?! 😱 that's freakin' good 😀 we've seen photos of your DIYed tube gears on the cover of every magazine and on the decaying walls of this city 😱
but be patient you'll see what will come up from my 211 project.
btw, don't stock your nose in other's personal issues. mind your business 😉
You don't see many amps as beautiful as this, wow!! (Only in my dreams)
Why is this not in the gallery to be drooled upon!
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