Difficult mechanical parts

The upper and lower lecher plate are pressed to each other using brass M3 bolds and nuts, insulated by teflon.

May22_04.JPG (427096 bytes)

The diameter of these insulators is 16 mm, the diameter of the inner ring 10 mm. Total thickness is 4 mm, equally devided between the outer and inner ring (each 2 mm thickness). The thickness of the inner ring is critical because it must fit smoothly in the upper lecher plate.


The HT feed-through is made of teflon as well.

ht teflon3.JPG (138476 bytes)

The diamensions are :

Overall diameter : 35 mm. Diameter of 1st ring : 20 mm. Diameter of 2nd ring : 10 mm.

The thickness of ring one and two is 1.5 mm. (both the cabinetplating as well as the brass ht decoupling capacitor plate have a thickness of 1.5 mm). The Thickness of the outer ring is approx. 7 mm and not critical. In the center a 3 mm hole is drilled to allow connection between the ht connector side and the ht capacitor.

May20_18.JPG (239730 bytes)

This picture gives a close (but fuzzy) look of the ht capacitor side. The 2nd ring can be seen with the 3 mm bold in the middle. A ring of 12 mm diameter and 3 mm hole is inserted first, followed by a soldering joint (with rf coil connected), a washer and finally a 3 mm nut.


Tube connectors

The tube connectors are made of brass. The dimensions are 10 * 15 * 9 mm. The hole has a diameter of 9 mm. A M5 bold is used to fasten the connector .

pin connector.JPG (174085 bytes)

Only one side is theaded. The other side is drilled to 5.1 mm to allow the M5 bold to pass without any friction.

QBL mechanics