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It
is still amazing that you can still purchase bottles in original boxes
at hamfests. The interior of the box lists hundreds of patent numbers |
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now , will all the decks fit. The
chassis that loomed so large now reveals itself to be undersized. This chassis was once an ISEP frame that I found in the dump. |
Brass shim stock is attached to the valve deck plate to provide a solderable surface. Many bypass caps need a positive earth |
I do my metal work outdoors. no fumes, no mess,
no dust ! |
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silver
plated teflon coax offcuts are used as flexible wide diameter RF
conductors. They are heat resistant and flexible. |
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Anode
tuning deck is completed. Anode tuning capacitor shaft is posively
grounded to take the dodgy wiper effectively out of circuit |
Vortex coil is mechanically stabiliese with these
fibre glass rods and held together with expoxy resin |
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Anode tuning deck is completed |
Anode DC isolation and RF coupling |
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Anode RF choke. This is a trial of a
conical inductor for choke service at HF. |
the anode tuning shafts are insulated from front
panel |
valve deck construction permits verification of
6CM5 filaments. My stock of bottles light up. Filaments draw about
10Amperes in total |
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the 6CM5 fits the metal work |
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input TR control deck, grid 1 control |
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rear
panel fan pressurises the chassis. There is also a purpose fan to cool
the valves. The other port is a passive hot gas exit port.
A fan should never be compelled to SUCK hot exhaust
gas, it
will have a very short life. |
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cutting big holes for the meters. They
ever seem to line up ! |
this deck will control grid 1 input and bias with
input TR relay, metering and sampling |
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vortex coil
mandrel |
vortex coil
mandrel with coil ! I ran out of wire before running out of mandrel |
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front panel is
taking shape. meters are for total anode current, and all indivdual
kathode currents and all screen grid voltages and a general
multimeter. |
12V psu
utility and fan supply and grid bias control deck pots, 24V relay power. I am
still designing the grid 2 bias regulator & control supply. Its harder than you think. |
EHV rectifier
with 3A diodes and bleeder resistors. They are ceramic metal
film and should have a long service life. |
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EHV rectifier
and HV capacitor stack |
EHV rectifier
and HV capacitor stack |
12DC psu
and EHT transformer . the remaining gap will be filled in
with the grid2 bias deck |
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gaze
into the Vortex |
input circuit
and TR relay controls EHV anode mercury relay and EHV recifier |
Anode deck and
valve deck |
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under the chassis, access to the valve sockets and valve deck components | | |
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showing here, EHT anode relay, input grid1 deck and filament inrush delay resistor | vortex inductor anode tank design | 6CM5 linear amp unit cell. There are 8 of these in parallel |
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