Look what I found this weekend! - Page 2

Original Burnedfingers · 30th January 2006, 09:55 PM

Quote:

You're a dog Joe... I like dog's... but, you're still a dog!

Be nice to me or NO treats.

beamnet · 30th January 2006, 10:03 PM

PLEASE photograph all these treasures and make these scavengers vomit from jealousy!

eapavant · 30th January 2006, 11:16 PM

you guys are way to funny!

I will start to inventory them and post something. there are lots of of the same tube. Some in boxes some with out. Some us navy tubes. I have always wanted a nice tube line stage and now I have no reason not to build one. My grandfather had a tv repair business and was into amature radio. He did have lots of transformers but they seem to have been trashed

I did find one left from his transmitter, it puts out something like 10k volts! I was thinking this one http://www.tube.be/4250a.html might make a good power amp? any ideas?

beamnet · 30th January 2006, 11:34 PM

you will be limited by iro cost. There is a thread on how to make a huge power amp.

For some reasons tetrodes aren't suitable forhifi

1 -because they have a "kink"

2 - because of secondary emission

I saw a few other tubes that might make good amps in your box though!

Get those pics online!!!

rdf · 30th January 2006, 11:41 PM

I don't know, 625 watts at 2% distortion in push-pull seems respectable to me.

http://www.mif.pg.gda.pl/homepages/f...8/4/4-250A.pdf

beamnet · 30th January 2006, 11:45 PM

and exactly WHAT iron are you going to use?
the biggest opt is the hammond 275 watt opt

that means using 3 at least! (www.tubecad.com has an articleon multople opt's)

Zen Mod · 30th January 2006, 11:50 PM

Quote:

Originally posted by rdf
I don't know, 625 watts at 2% distortion in push-pull seems respectable to me.

http://www.mif.pg.gda.pl/homepages/f...8/4/4-250A.pdf

and amp must be positioned in backyard (fans) or in chimney (without fans)

eapavant · 31st January 2006, 12:38 AM

So I went through one box. Here is a list of what I found. I will try to get some images up soon. Most of these I have at least two of. Many I have 3 or more.

931a
3db3
12av7
5963
6eab
6x4
6143
6ua8
13jz8
6jc5
61b6
6bb3
3cy5
2e24
3db3
6cj3
6gj7
6al5
12by7a
6b46
837
6l6
12at7
813
12sn7
25l6g7
70l7gt
3at2a
6146
6ba6
12sj7
6sn7
6sc7
12sr7
1629
6s4a
6bq7a
12by7a
6gh8a
6c5
6ha5
2d21
12a66
6be6
12jt5
6j6
6c4

tubelab.com · 31st January 2006, 01:10 AM

Quote:

Three 4 1000a's a 4 400a and four 4 250a.

I'm all for building big amplifiers, but these might be too big for someone not experienced with instantly lethal voltages. I built an amplifier that used a 4-400 once, but it was an RF amplifier for ham radio use. An audio amplifier with any of these tubes will be a specialized amplifier requiring custom transformers.

I had two 4-1000's, I sold them on Ebay for enough cash to buy transformers for a more "normal" amp. You might be able to do the same. I got over $300 for the two tubes.

Original Burnedfingers · 31st January 2006, 01:31 AM

The 250 just has to be a good tube. Anything that takes 14 amps to light the filament is one heck of a tube. Even if you didn't make anything out of it there is potential for a hell of a night light.

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30th January 2006, 09:55 PM	#11
Original Burnedfingers diyAudio Member Join Date: Nov 2002	Quote: You're a dog Joe... I like dog's... but, you're still a dog! Be nice to me or NO treats.

30th January 2006, 10:03 PM	#12
beamnet diyAudio Member Join Date: Jun 2004 Location: enschede	PLEASE photograph all these treasures and make these scavengers vomit from jealousy!

30th January 2006, 11:16 PM	#13
eapavant diyAudio Member Join Date: Aug 2005	you guys are way to funny! I will start to inventory them and post something. there are lots of of the same tube. Some in boxes some with out. Some us navy tubes. I have always wanted a nice tube line stage and now I have no reason not to build one. My grandfather had a tv repair business and was into amature radio. He did have lots of transformers but they seem to have been trashed I did find one left from his transmitter, it puts out something like 10k volts! I was thinking this one http://www.tube.be/4250a.html might make a good power amp? any ideas?

30th January 2006, 11:34 PM	#14
beamnet diyAudio Member Join Date: Jun 2004 Location: enschede	you will be limited by iro cost. There is a thread on how to make a huge power amp. For some reasons tetrodes aren't suitable forhifi 1 -because they have a "kink" 2 - because of secondary emission I saw a few other tubes that might make good amps in your box though! Get those pics online!!!

30th January 2006, 11:41 PM	#15
rdf diyAudio Member Join Date: Jun 2004 Location: big smoke	I don't know, 625 watts at 2% distortion in push-pull seems respectable to me. http://www.mif.pg.gda.pl/homepages/f...8/4/4-250A.pdf

30th January 2006, 11:45 PM	#16
beamnet diyAudio Member Join Date: Jun 2004 Location: enschede	and exactly WHAT iron are you going to use? the biggest opt is the hammond 275 watt opt that means using 3 at least! (www.tubecad.com has an articleon multople opt's)

31st January 2006, 12:38 AM	#18
eapavant diyAudio Member Join Date: Aug 2005	So I went through one box. Here is a list of what I found. I will try to get some images up soon. Most of these I have at least two of. Many I have 3 or more. 931a 3db3 12av7 5963 6eab 6x4 6143 6ua8 13jz8 6jc5 61b6 6bb3 3cy5 2e24 3db3 6cj3 6gj7 6al5 12by7a 6b46 837 6l6 12at7 813 12sn7 25l6g7 70l7gt 3at2a 6146 6ba6 12sj7 6sn7 6sc7 12sr7 1629 6s4a 6bq7a 12by7a 6gh8a 6c5 6ha5 2d21 12a66 6be6 12jt5 6j6 6c4

31st January 2006, 01:31 AM	#20
Original Burnedfingers diyAudio Member Join Date: Nov 2002	The 250 just has to be a good tube. Anything that takes 14 amps to light the filament is one heck of a tube. Even if you didn't make anything out of it there is potential for a hell of a night light.