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Vintage Asylum Classic gear from yesteryear; vintage audio standing the test of time. |
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Vintage Asylum Classic gear from yesteryear; vintage audio standing the test of time. |
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In Reply to: Knight ka-25 posted by BillyJack on March 2, 2007 at 13:51:40:
The 6bm8/ecl82 is a dual tube just as the 12ax7 (IOW each bottle has two separate *tubes* within). So two 6bm8 per channel provide driver, splitter, & push-pull outputs. The 12ax7 then would be for preamp stages. Check your local public library or on-line for Sams Photofacts to possibly discover a schematic. Alternatively, if you are capable of assembling a jig-saw puzzle or could solve those maze puzzles on the backs of cerial boxes as a kid, drawing your own from observation should not be difficult. Use your meter to trace switch positions if visual deduction is frustrating. Discover tube pin-outs (& other schematics for a lay-out guide) for your drawing from the link below. Additionally, just knowing the pin-out can aid diagnostics such as signal-tracing via control grid & voltage measurements per anode & cathode (begin @ the output & work your way to input).
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Follow Ups
- Re: Knight ka-25 - Ron Oehlert 16:46:35 03/02/07 (6)
- Re: Knight ka-25 - BillyJack 17:04:53 03/02/07 (5)
- Re: Knight ka-25 - Tom Bavis 06:58:04 03/03/07 (2)
- Re: Knight ka-25 Optical illusion above - Al Nico 06:17:53 03/04/07 (1)
- Re: Knight ka-25 Optical illusion above - Ron Oehlert 13:06:42 03/04/07 (0)
- Re: Knight ka-25 - corerosin 04:13:59 03/03/07 (0)
- Re: Knight ka-25 - Ron Oehlert 17:39:19 03/02/07 (0)
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