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In Reply to: But bear in mind the 1 amp filament of a 26 posted by andy evans on May 8, 2007 at 15:04:14:
Hi.If you want PURE DC to power the tube filaments, what can be better than a rechargeable cell like SLA, cheap to own & no hassles to run.
I am using one for my phonostage heaters (0.6A6.3V) powered by a small 5AH cell, rechargeable by a switch-mode PS. The whole outboard power supply pack, comprising the SLA cell, the SMPS board & charge/discharge swithces/LED indicators/voltage check-points, etc, is DIY built in a small cheapie plastic equipment box (7"x2.75"x4.5"). It looks cool & neat, sitting beside my phonostage/linestage.
This is my "build-and-forget" pure DC supply solution for my phonostage tube heaters. No "miracles" if you know the way.
For 1A or larger current loads, you can go for 7AH or high rating.
One cell can do it all.c-J
PS: Any battery, dry or wet, is a complex AC network itself. Something got to be done to make it sound good. SLA cells are no exceptions.
Follow Ups:
'This is my "build-and-forget" pure DC supply solution for my phonostage tube heaters.'Really ? It seems that you built it then forgot a battery does not maintain it's charge . I bet a 5AH cell only has around four hours use , less if you've purchased cheap batteries which have past their shelf life date . How do you keep the heaters within +/- 5% of 6.3 volt for the heaters ? A much better solution would be to use an extra SLA in series and a CCS between the heater supply and the battery . This would maintain the heater supply at optimal conditions , even when the batteries begin to drain .
HI.Being a very very busy guy, I seldom get the luxury of 5-hour (!!) session for my vinyls.
BTW, you ever touch vinyls? If not yet, don't try it, amen!
Here is 'routine' rituals I go through to play a vinyl, put the LP on, secure it with the disc stabilizer, inspect & clean the stylus, check the DYNAMIC balance of the cartridge/stylus, wet the disc with pure distilled water (ad I always play wet), check the motor speed again, then lower the cartridge to the right track dead-slow manaully using the turntable hydraulic lever..........
But before I start these sorta painful rituals, everytime I check the cell voltage first, monitored by a dedicated voltage digital meter always inserted to the voltage check points installed on the power pack housing. I push the quick-charge button to start charging the cell if found drop a bit too low. This is always done before I start to exercise my time consuming LP routine rituals.
So far so good. Well, it worths the "pain" considering the joy of
musical enjoyment & sorta being-there engagement that only vinyl can offer.c-J
PS: Your CCS suggestion is correct, technically. But as a vinyl fan, I try to refrain from any SS sonic pollution after going such a long long way.
Neato, Jack. I've never heard of this being done.I've thought about doing this before, but didn't because I thought that the water would trap more airborne dust and cake it to the record's surface.
It really sounds like a good idea with many benefits (noise reduction and heat dispersal being the big ones) but I have a concern: does the viscosity (albeit very low viscosity) of the water affect in any noticable way the cantilever's recovery time? I realize that the resistance of pure water is going to be very low, especially when the force is being exerted by a recovering (returning to zero on axis) low-compliance cartridge, but it still seems that there would be a noticable affect...probably an audibly positive one.
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