Need 45 tubes

Original Burnedfingers · 5th April 2006, 10:56 AM

Is anyone making the 45 tube anymore? Can I sub 2A3's in place of 2) 45's?

arnoldc · 5th April 2006, 11:41 AM

Emission Labs EML45 is current production but really expensive. Is it difficult to source 45 in the U.S. now? We had a shipment of about two dozen 45s last year from te U.S.

You can put in a 2A3 in a 45 circuit. The difference will be higher B+ (250V vs. 275V), lower current (50mA vs 35mA), and load (2.5K vs 5K). My Sovtek never complained.

kevinkr · 5th April 2006, 04:26 PM

Late ST envelope type 45's can be had on eBay for relatively reasonable money. There are several companies that make the 45 currently, TJ, EML and AVVT come to mind - unfortunately these are well over $250/pr and depending on brand can be much more than this.

The 2A3 with changes previously mentioned will work, but it is a different tube, and sounds quite different. I recommend that if you want a 45 amplifier you buy good NOS or used 45's.

anatech · 5th April 2006, 05:15 PM

Hi Joe,
This is for repair on your old radio's? They are darn expensive. I would not design anything new with 45's just due to that.

I bought a few for my old sets. I refuse to pay the nutty prices for new manufacture or some of the NOS guys either. It really hurt to lay that much money down.

-Chris

vt_229 · 5th April 2006, 06:45 PM

The 46 will work as a good sub if you tie the grid 2 to the plate. it uses the 5pin socket so this is NOT a drop in. I have done this one several old amps for guys that want to use them, and were not concerined with altering the OEM set up. For a little more info on the 46/45 switch as well as using 2a3 in the same amp check out this web page http://www.the-planet.org/Ragtop.html

tubelab.com · 5th April 2006, 08:45 PM

Keep in mind that a 2A3 draws 2.5 amps of filament current. This may make your filament transformer unhappy.

Original Burnedfingers · 5th April 2006, 09:24 PM

This is for an Atwater Kent Radio so I would like to keep it as close to stock as I can.

Thanks

arnoldc · 5th April 2006, 11:24 PM

Atwater Kent, nice piece of audio gear

FWIW, I got some Globe Cunningham 245 from my friend for about $75 each. Don't know where in the US he sourced them though.

vt_229 · 6th April 2006, 03:33 PM

Good find, with an AK changes like a 46 would be disastrous to the value and a darn shame. Hope they sound good that’s a fair price as long as they have a lot of life in them, NOS?

anatech · 6th April 2006, 07:12 PM

That's what I had to buy mine for. I think it's a 60C.

-Chris

5th April 2006, 10:56 AM	#1
Original Burnedfingers diyAudio Member Join Date: Nov 2002	Need 45 tubes Is anyone making the 45 tube anymore? Can I sub 2A3's in place of 2) 45's?

5th April 2006, 04:26 PM	#3
kevinkr diyAudio Moderator Join Date: Sep 2004 Location: Boston, Massachusetts Blog Entries: 6	Late ST envelope type 45's can be had on eBay for relatively reasonable money. There are several companies that make the 45 currently, TJ, EML and AVVT come to mind - unfortunately these are well over $250/pr and depending on brand can be much more than this. The 2A3 with changes previously mentioned will work, but it is a different tube, and sounds quite different. I recommend that if you want a 45 amplifier you buy good NOS or used 45's. __________________ "Extraordinary claims require extraordinary evidence." - Carl Sagan

5th April 2006, 06:45 PM	#5
vt_229 diyAudio Member Join Date: Apr 2006 Location: north texas	45s The 46 will work as a good sub if you tie the grid 2 to the plate. it uses the 5pin socket so this is NOT a drop in. I have done this one several old amps for guys that want to use them, and were not concerined with altering the OEM set up. For a little more info on the 46/45 switch as well as using 2a3 in the same amp check out this web page http://www.the-planet.org/Ragtop.html

5th April 2006, 08:45 PM	#6
tubelab.com diyAudio Member Join Date: Jul 2005 Location: South Florida	Keep in mind that a 2A3 draws 2.5 amps of filament current. This may make your filament transformer unhappy. __________________ Too much power is almost enough! Turn it up till it explodes - then back up just a little.

6th April 2006, 03:33 PM	#9
vt_229 diyAudio Member Join Date: Apr 2006 Location: north texas	45s Good find, with an AK changes like a 46 would be disastrous to the value and a darn shame. Hope they sound good that’s a fair price as long as they have a lot of life in them, NOS?


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5th April 2006, 11:41 AM	#2
arnoldc diyAudio Member Join Date: Apr 2003 Location: Makati	Emission Labs EML45 is current production but really expensive. Is it difficult to source 45 in the U.S. now? We had a shipment of about two dozen 45s last year from te U.S. You can put in a 2A3 in a 45 circuit. The difference will be higher B+ (250V vs. 275V), lower current (50mA vs 35mA), and load (2.5K vs 5K). My Sovtek never complained.

5th April 2006, 05:15 PM	#4
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi Joe, This is for repair on your old radio's? They are darn expensive. I would not design anything new with 45's just due to that. I bought a few for my old sets. I refuse to pay the nutty prices for new manufacture or some of the NOS guys either. It really hurt to lay that much money down. -Chris

5th April 2006, 09:24 PM	#7
Original Burnedfingers diyAudio Member Join Date: Nov 2002	This is for an Atwater Kent Radio so I would like to keep it as close to stock as I can. Thanks

5th April 2006, 11:24 PM	#8
arnoldc diyAudio Member Join Date: Apr 2003 Location: Makati	Atwater Kent, nice piece of audio gear FWIW, I got some Globe Cunningham 245 from my friend for about $75 each. Don't know where in the US he sourced them though.

6th April 2006, 07:12 PM	#10
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	That's what I had to buy mine for. I think it's a 60C. -Chris

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