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Author Topic: -Y suffix tubes  (Read 836 times)
G3RZP
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Posts: 4574




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« on: October 22, 2007, 11:46:11 AM »

i know that there were the 6SJ7-Y and 6SB7-Y with low loss, mica filled bases. Were there others, such as a 6SG7-Y and 6SH7-Y? They would be the other two types I would have expected to be made with a -Y suffix. I know the 6SJ7-Y was used in some models of the BC221: was it used elsewhere? An where was the 6SB7-Y used?
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N2EY
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Posts: 3879




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« Reply #1 on: October 25, 2007, 12:47:23 PM »

"6SJ7-Y and 6SB7-Y with low loss, mica filled bases."

AFAIK, the mica-filled base thing was partly for low loss but also partly for improved stability. The ARC-5 receivers didn't need low loss mixer tubes, but they
used the 12K8Y.

"Were there others, such as a 6SG7-Y and 6SH7-Y?"

Never seen those. I have seen 6V6GTY, a low loss transmitting type, the 5R4GY and variants, the 12K8Y and some others.

"where was the 6SB7-Y used?"

Early FM broadcast receivers. 6SB7 is a metal 6BA7, probably the best pentagrid mixers made. Noisy but
high gain and low pulling.

73 de Jim, N2EY
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G3RZP
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« Reply #2 on: October 26, 2007, 10:14:59 PM »

I've never come across the 12K8Y. None of the ARC5 receivers I've seen had them in. One would have thought the 717A would have had a low loss base, and thus have been 717AY. 5R4GY is another matter. Interestingly, I cannot find a 5R4G data sheet - I wonder if there ever was a 5R4G? I suspect that the 5R4GY was better insulation for high voltage, rather than low loss or stability. Then there were other versions for use up to higher altitudes.
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