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Mietek Jozwik
PL Articles: 11 Schem.: 0 Pict.: 4 05.May.06 14:00 |
Heathkit SB102
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I am looking for any experience in replacing original transmiter output tubes 6146 by the other tube model. |
Michael Schlör
D Articles: 73 Schem.: 260 Pict.: 106 05.May.06 14:35 |
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Hello Mietek, over the decades I used several pairs of the 6146 family, such as 6146A, 6146B and the rugged 6146W. You only have to re-neutralize the PA. Don't mix different tube models, always use a pair of the same tube type. Depending your power-supply, I would prefer the -B or -W tubes. Those can work better with Ua over 850V DC. There is a difference in Plate Dissipation: the 6146, 6146A and 6146W 25W, the 6146B 35W 73, Michael Schlör DJ8IJ This article was edited 05.May.06 15:52 by Michael Schlör . |
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Mietek Jozwik
PL Articles: 11 Schem.: 0 Pict.: 4 08.May.06 10:42 |
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Hi, thanks for answer. The problem with that tube is they are practically not available in Poland. So I am looking for replacemnt. Some TV's sweep tubes looks similar in catalogs but dummy replacement can fire out nice old piece of equipment. Vy, 73 Mietek sp5hbt |
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Michael Schlör
D Articles: 73 Schem.: 260 Pict.: 106 08.May.06 16:05 |
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Hello again, DO NOT use any TV sweep tubes!! This will damage your SB102!! If they look similar to the 6146's, for shure: they are NOT the same. The tube data will be completely different! It's very difficult to redesign the PA-tube configuration for a sweep tube as well as the Pi-network! The only replacement-tubes you can use are: 8298A or QE05/40 or YL1370. These tubes can be used by only neutralizing the PA. 73, Michael Schlör DJ8IJ |
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