For Sale: 19 Set Spare Valve Box

[r.morrison]

Up for grabs is complete 19 set spare valves/tubes box. All the valves are there including 4 "socks" over 4 of the tubes. Some of the paint has come off of the lid (see photos). $125.00 plus delivery. PM me for further info.
And PLEASE...... no comments from members like I went though recently on the Facebook portion of MLU. Run your own ads! Thanks....Robert

[David Dunlop]

Looks like a very nice American issue set, Robert.

The cloth ‘socks’ and pair of E1148 valves are the clue.

David

[r.morrison]

Thanks David for the input. Robert.....

[Bob Carriere]

Hi David

If this means that it is a for a USA mark II set what would be in there for the Canadian mark III as a substitute for the 1148 ......??? and can the 1148 be used in the Canadian mark III...??

Curious as I have some..... in fact I think all my spare boxes have 1148.

Cheers

[David Dunlop]

Hi Bob.

If I remember correctly, the Americans experienced a high failure rate with their early E1148, so dropped the 6K7G spare valve in the outer position of the Spare Valves Box in order to carry a second E1148. On the Canadian side, we never had that problem so just the single, inner spare E1148 was ever carried in their Spare Valve Boxes. The E1148 is a required Valve in any North American made Mk II or Mk III 19-Set.

The American Spare Valves Cases used black, cotton ‘socks’ to cushion several of the spare valves, if the case got a hard, lateral shake. To accomplish the same thing, some, but not all’ Canadian makers of the Spare Valves box used a long strip of black roofing felt wound among the valves to cushion them. You can see this as a heavy black line printed on the valve identification chart glued to the pad in the lid of the case. I think some makers may even have used two strips of the felt.

David

[Bob Carriere]

Thanks for the info David........ I have a box or two with corrugated cardboard inserts.... they may have been repacked.

[Chris Suslowicz]

Originally Posted by Bob Carriere

Hi David

If this means that it is a for a USA mark II set what would be in there for the Canadian mark III as a substitute for the 1148 ......??? and can the 1148 be used in the Canadian mark III...??

Curious as I have some..... in fact I think all my spare boxes have 1148.

Cheers

British sets used the CV6, VR135 (DET20), US and Canadian sets used the slightly different E1148 which had a lower mutual conductance (gm) figure. R33 (27,000 ohms) was shunted with R33.1A (47,000 ohms) to allow this to work. (If the British valve is used instead, R33.1A should be disconnected.)

I thought the fabric 'socks' were included to protect the operator's fingers if changing a hot (or broken) valve.

The valve carriers I've seen in US and Canadian cases were all stamped metal with sockets fitted. British cases had sponge rubber inserts - a block that virtually filled the case and had holes to take the valves, or a grid of rubberised animal hair partitions. Later cases with /T (tropicalised) suffix had an arrangement of plastic-impregnated cardboard tubes (bonded together) and the valves were supposed to be inserted still in their waxed-paper wrapping (to provide some vibration damping).

The case designs varied slightly between manufacturers, different catches, etc. but were all interchangeable. (The carrier insert would differ according to intended application - WS19 and 22 used the same insert with a different content list in the lid, WS19HP had Case No.5 with a wooden framework that held 4 x 807s, and a drilled wooden block near the lid holding spare lamps and fuses (for the British "Amplifier RF No.2", not the Canadian one).

Best regards,
Chris.

[Bob Carriere]

.....was doing a quick search for available tubes on Ebay....... some of the best deals are unfortunately originating from Ukraine....... some shipping delays expected....!!!!