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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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In Reply to: RE: Hi Mike, Both the LEAK St20s have an NTC on the 240V/50Hz primary posted by Michael Samra on June 11, 2012 at 23:19:57:
Likely to be rebuilding two TL12 Plus soon. The mono versions with an EF86 input tube. Both small signal tubes will become a 6DJ8 twin-triode one triode only, and a 6CG7 and a FET CCS.
For two bass channels up to 150 - 400 hz 3rd order filter, possibly a knee'd type, a PLL* 1st then cascaded by a 2nd order active low-pass.
20wpc in UL or ?watts in pentode, we'll see!
I'll probably add AC balance pots and a LED to each op't stage in all 6 channels.
*One more question, with Passive Line Level filters, a bandpass filter is possible? Yes?
IE a 1st-order 'matching' high-pass in the bass and a 1st low-pass at 6kHz?
Note that I'll be using the sealed sphere's own 2nd order slope as well. The driver is a WR 5 inch and should be okay power-wise with a 1stord. and the enclosure's own roll-off. I'll need to reduce the Vb with some roof-tilers epoxy/sand mixture.
Three spheres stacked using cut-down basketball hoops and and adjustable height column-stand per side.
Columns? Remember when DOS type computers and their noisy dot-matrix printers needed a 3 shelf thing on 4 rollers? That's where the two columns will come from. Two triangular bases and 2 more matching rollers.
You'll soon have mail.
Warmest
Tim Bailey
Skeptical Measurer & Audio Scrounger
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Follow Ups
- Will do! - Timbo in Oz 00:16:03 06/12/12 (0)
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