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Old 13th November 2012, 02:44 PM   #41
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Quote:
Originally Posted by Tony View Post
not the 6lr8, but the 13lr8 is...at rogalski's in florida...
Just look at the site can not find any 13lr8 anyware ?
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Old 13th November 2012, 02:57 PM   #42
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21lr8, 31lr8 ... no 13lr8
not sure they exist
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Old 13th November 2012, 04:02 PM   #43
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Quote:
Originally Posted by donnyab View Post
21lr8, 31lr8 ... no 13lr8
not sure they exist
they have 21lr8 for 1 dollar so I guess he meant 31lr8 .
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Old 13th November 2012, 04:19 PM   #44
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Quote:
no 13lr8 not sure they exist
I don't think they do. The odd voltage tubes were created to operate with all the heaters wired in series operating from line voltage. They all must have the same current rating for this to work. The common series current ratings for TV sets are 300 mA, 450 mA, and 600 mA.

The 300 mA tube is the 31LR8 (31.5 volts)
The 450 mA tube is the 21LR8 (21 volts)
The 600 mA tube is the 16LR8 (15.8 volts)
And the 6LR8 is a parallel 6.3 volt tube at 1.5 amps.

These all consume 9.45 watts of heater power. If there was a 13LR8 it would run at a very non standard 725 mA.

The 31LR8 and the 21LR8 were on the 75 cent list until Dales inventory got back to "normal" levels, then they were removed. I am responsible for the 6HB6 being removed from the list. The 6LU8 was indeed $2 at VacuumTubes.net some time in the past. I make spreadsheets of cheap tubes VS applications, and I have an old one listing the 6LU8.

The 16LU8 and 21LU8 (12 pin version) and the 31LR8 are still on the dollar list at ESRC.
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Old 13th November 2012, 05:02 PM   #45
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You lucky guys!
I don't know of any comparable place on this side of the pond.
For everything with vacuum inside and at least 3pins sticking out, they will ask more than 4-5 Euro.
Maybe I am just looking at the wrong places.
Martin
PS: Not including ePay
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Old 13th November 2012, 08:25 PM   #46
pancaQe is offline pancaQe  United States
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With the schematic that vinylkid posted here. What might be a good substitute for the 5V4GA rectifier? My AC input would be ~ 355vac. I have on hand a 5R4GY (which I can't make heads or tales of the spec sheet, it seems to have more info on operational allitude, it is a JAN tube so I guess it belongs in a B-27 bomber), 5U4GB (from what I can tell wouldn't be as much voltage output as the 5V4GA), GZ34 (which doesn't appear to put out as much as the 5V4GA), and a 5Y3 (which I'm fairly sure won't do) Any suggestions?
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Old 14th November 2012, 04:07 AM   #47
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9 pin: 6ky6, 6jg5, 6jd6, 6jc6, 6hm6, 6ej7,404

octal: 6sj7, 6j7,1232,1620

all off-springs of sorts to the mighty #15 tube

and substitutes to the 6au6 tube
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Old 14th November 2012, 02:59 PM   #48
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Not trying to be facetious, but wouldn't it be less expensive to just buy a couple of 7-pin mini sockets? I would think that sockets would priced less than tubes. Unless you already have some of the recommended tubes, that is.
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Old 14th November 2012, 03:16 PM   #49
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I would think so, but he wanted tube subs.
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Old 14th November 2012, 03:18 PM   #50
DF96 is offline DF96  England
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He asked for rectifier subs?
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