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Lowrey LSA Organ - what tubes in it?

BmWr75

BmWr75

Top octave? pfffffftttttt
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Am going to pick up this freebie this afternoon. Have seen pics, but can't tell what tubes are in the tone board sections. Bunch of them though. Anyone know what tube number these might be? Baldwin used 12AU7 and 12AX7 typically, but I've read these might be some 6XXX type tube.

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Just found a schematic. Looks like the tone board tubes are 6X8. Also shows some 6SL7, 6SN7 and 6V6. We shall see.
 
ah the 6X8, a tube that seems like it ought to be useful, but mostly just isn't for typical audio stuff. Triode-pentode with a common cathode.
 
Tube compliment - all Lowrey branded

42 - 6X8
5 - 12AX7 (4 black plate and 1 gray plate)
2 - 6V6GT smoked glass
1 - 5U4 GB

Haven't tested any of them yet. Will do that later.
 
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ive salvaged a few bladwin organs, 30-something 6SN7 on the tone board. ive never come across or seen this one before.
 
Interesting audio uses for 6X8, asymetric LTP and error amp for regulated pwr supply

Using non-inverting part of Fred Nachbar 6X8 phase splitter as guitar preamp/effect?

Acquired several 6LJ8 tubes pentode/triode sharing a cathode. These are similar to the 6X8. In the interest of putting things to use, I thought of using part of the "Enhanced Cathode-Coupled Paraphase" found here http://www.dogstar.dantimax.dk/tubestuf/paraph.htm as a preamplifier of sorts...
www.diyaudio.com www.diyaudio.com
 
ceylon said:
ive salvaged a few bladwin organs, 30-something 6SN7 on the tone board. ive never come across or seen this one before.
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My Amplitrex tube tester won't test them either. Could probably get the vendor to send the test parameters, but not sure it is even worth messing with since uses for 6X8 are so limited. The other tubes in the organ all tested good, so would guess these 6X8s are good too.
 
BmWr75 said:
My Amplitrex tube tester won't test them either. Could probably get the vendor to send the test parameters, but not sure it is even worth messing with since uses for 6X8 are so limited. The other tubes in the organ all tested good, so would guess these 6X8s are good too.
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ah, bummer
 
BmWr75 said:
Am going to pick up this freebie this afternoon. Have seen pics, but can't tell what tubes are in the tone board sections. Bunch of them though. Anyone know what tube number these might be? Baldwin used 12AU7 and 12AX7 typically, but I've read these might be some 6XXX type tube.

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Are the 12ax7 baldwin with green lettering if so, are they 17mm long plates or 13-14 mm short black plate tube. if there short black plate set them carefully aside for testing surprising great sound from them short black plate if green lettering there most likely Sylvania a great sounding short plate..also with a tipped D getter on top the short plates...wonderfull 12ax7 tubes.
 
fxer1982 said:
Are the 12ax7 baldwin with green lettering if so, are they 17mm long plates or 13-14 mm short black plate tube. if there short black plate set them carefully aside for testing surprising great sound from them short black plate if green lettering there most likely Sylvania a great sounding short plate..also with a tipped D getter on top the short plates...wonderfull 12ax7 tubes.
Click to expand...

They were all Lowrey branded and what appeared to be 12A?7 turned out to be 6X8.
 
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