Hi all,
Latest progress on the Sperry radar clock - I found a very helpful
transformer manufacturing shop whose owner was happy to vacuum impregnate
and bake the howling transformer for me. Alas, it only made a very small
difference, if any. It sounds like the problem is magnetostriction in
Morris
Are you switching off the HT/EHT to the tube when the heater is off as
well? My understanding is that it is not good to switch the heater on
while there is full HT on any thermal valve/tube.
You might take the opportunity to soft start the CRT heater - I can PM
you a schematic I'm
Hi Morris,
Is the transformer sound also there if the steel case is removed? May be the
case is working as a speaker membrane... In that case you can consider to
make an aluminium or plastic case.
To muffle the sound you can use those bituminous plates also used for
deadening resonance in car
Has anybody used this outfit for PCBs? Accutrace inc, trading as pcb4u.com.
http://www.pcb4u.com/a1ad77.asp
I am asking, because they are doing a US $30 + $10 FedEx shipping deal (is this
US only?) on ten double side boards up to 20 square inches, 129 square
centimetres. This seems a very
Hi,
Quixotic Nixotic wrote:
Has anybody used this outfit for PCBs? Accutrace inc, trading as
pcb4u.com.
[...]
I am asking, because they are doing a US $30 + $10 FedEx shipping
deal (is this US only?) on ten double side boards up to 20 square
inches, 129 square centimetres. This seems a very
Yes, you know the problem, I hestated because there is so much
mis-information on audio-fool sites. I just tend to take a
precautionary approach when I can to extending tube life. But running
the CRT heater warm is an alternative to full cold soft start. My
current scope clock which is
On 10 Aug 2014, at 13:37, Arne Rossius wrote:
Hi,
Quixotic Nixotic wrote:
Has anybody used this outfit for PCBs? Accutrace inc, trading as
pcb4u.com.
[...]
I am asking, because they are doing a US $30 + $10 FedEx shipping
deal (is this US only?) on ten double side boards up to 20 square
Yes, they use to be my goto board house. I used them mostly for
multilayer boards (4 or more layers), and they did very good work. I
haven't used them since ~2008. Not because of anything they did, but
because of my PCB needs. I've only done double sided (2 layers) since that
time. The
Actually, electromechanical accounting calculators of that time, which the
Anita intended to replace, were as complicated to operate as this ones.
On Saturday, August 9, 2014 11:22:09 AM UTC-3, gregebert wrote:
What's amazing is the relatively small number of electronic components
given it's
On 8/10/14 2:00 AM, Morris Odell wrote:
I also have a question - among other things the PIR motion detector
switches the power to the CRT heater. Is it worth dribbling a little bit of
current through the heater when it's off so that it heats up faster when
the PIR senses an observer? If so, how
I assume that they did enough study of the idea to ensure a minimum of
expensive warranty repairs.
For consumer equipment, I always assumed keeping filaments always-on was a
way for tube-sets to compete with increasing numbers of solid-state TVs
that turned-on much faster. The
11 matches
Mail list logo
