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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: lowest Z line-drive CF mode noval twin-triode, must be no taller than 12A_7 types. posted by Timbo in Oz on January 4, 2016 at 19:15:13:
the outer shell is pressed steel and wraps around the guts - attached to the front panel - by about 4mm.To take one apart one has to undo two long bolts at either side of the back. Then the outer shell pulls off backwards / or you pull the guts towards you.
The height limit I reported engages with that ~4mm wrap around.
So, it just is not as simple to put in a taller tube, by cutting a hole in the top of the outer shell - unless one is willing to wait for cooling to occur and pull it out - before dismantling the case.
But, given the slight projection - of about 5-10mm max - above the top with all the other tt options - I'm not real keen on trying to push in / pull out such a tube, with the box closed up.
IF something is wrong WITH the pre-amp - like say the CF output tube has died?
Well, I would have to wait until I - MIGHT be ABLE - to pull the longer and HOT tube out (which is never going to protrude enough to get a really good grip on it) vertically - BEFORE - I could take the pre-amp apart.
........................
Simply put, is the 5687 family going to give me a lower output Z in CF than any 12AU7?
If so, I'll be buying a good few that come in as short as any 12A_7.
TIA.
Warmest
Tim Bailey
Skeptical Measurer & Audio Scrounger
Edits: 01/05/16 01/05/16
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Follow Ups
- Why am I not keen on a taller tube OR the QUAD 22 box and its 'mechanics' - Timbo in Oz 01:42:57 01/05/16 (2)
- RE: Why am I not keen on a taller tube OR the QUAD 22 box and its 'mechanics' - Eli Duttman 08:41:27 01/05/16 (1)
- Thanks, Eli. - Timbo in Oz 12:41:01 01/05/16 (0)
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