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In Reply to: RE: lowest Z line-drive CF mode noval twin-triode, must be no taller than 12A_7 types. posted by Timbo in Oz on January 04, 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 01/05/16Follow Ups:
Tim,
It just might be time for a little "sand". ;> ) An IRFBC20 MOSFET will get you a lower O/P impedance than the tubes mentioned. It also happens to be very volumetrically efficient. Low reverse transfer capacitance MOSFETs make very transparent voltage followers.
Eli D.
That's probably the ticket.
With the line-drive tube eliminated I will likely have enough room for an IR remote ALPS VC.
And, maybe room to put SE to balanced transformers just after the FETs. Or just behind the pre box.
That would allow a balanced in ADC kit to feed a DSP-Eq box at my seat, down the track.
Warmest
Tim Bailey
Skeptical Measurer & Audio Scrounger
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