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Old 5th April 2006, 10:56 AM   #1
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Default Need 45 tubes

Is anyone making the 45 tube anymore? Can I sub 2A3's in place of 2) 45's?
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Old 5th April 2006, 11:41 AM   #2
arnoldc is offline arnoldc  Philippines
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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.
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Old 5th April 2006, 04:26 PM   #3
kevinkr is offline kevinkr  United States
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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.
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Old 5th April 2006, 05:15 PM   #4
anatech is offline anatech  Canada
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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
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Old 5th April 2006, 06:45 PM   #5
vt_229 is offline vt_229  United States
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Default 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
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Old 5th April 2006, 08:45 PM   #6
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Keep in mind that a 2A3 draws 2.5 amps of filament current. This may make your filament transformer unhappy.
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Old 5th April 2006, 09:24 PM   #7
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This is for an Atwater Kent Radio so I would like to keep it as close to stock as I can.

Thanks
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Old 5th April 2006, 11:24 PM   #8
arnoldc is offline arnoldc  Philippines
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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.
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Old 6th April 2006, 03:33 PM   #9
vt_229 is offline vt_229  United States
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Default 45s

Good find, with an AK changes like a 46 would be disastrous to the value and a darn shame. Hope they sound good thatís a fair price as long as they have a lot of life in them, NOS?
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Old 6th April 2006, 07:12 PM   #10
anatech is offline anatech  Canada
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That's what I had to buy mine for. I think it's a 60C.

-Chris
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