<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto">I expect this is most likely the spring in the socket and am not aware of different depth sockets for bayonet-base lamps/bulbs.<div><br></div><div>One reason old Fresnels are falling into disuse is lack of availability of good replacement porcelain sockets for bayonet-base lamps/bulbs.</div><div><br></div><div>Bruce</div><div><br id="lineBreakAtBeginningOfSignature"><div dir="ltr"><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><span style="background-color: rgba(255, 255, 255, 0);">"A society grows great when old people plant trees whose shade they know they shall never sit in." - Greek proverb</span></div></div><div dir="ltr"><br><blockquote type="cite">On Sep 21, 2023, at 14:40, Steven Mclean via Stagecraft <stagecraft@theatrical.net> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr"><div dir="ltr">First, I owe the list an apology. You may remember that I was trying to sort out what was going on in the theatre I "inherited" regarding dimmer assignments (whereas there were circuits labled 1 through 120, but only one rack of 96 dimmers feeding them. <div><br></div><div>Nothing exotic was going on. It turns out that when the "new" dimmer rack was installed in the facility, they didn't have the wherewithal to do dimmer-per-circuit (which was the norm at the time) for all 120 existing circuits, so once they got to 97, they connected that circuit to dimmer 1 (in addition to the circuit labeled "1") and 98 to dimmer 2...etc. I had a conversation with the guy in charge of the facility 30 years ago, and he put into my head that "dimmer doubling" which was new at the time) was going to be used. It apparently was not.</div><div><br></div><div>Now I am puzzled by another problem. We have OLD Fresnel instruments in the space and I have run across a pile of 8" Fresnel fixtures that seem to have the same problem. The instruments check out just fine with the continuity tester. Continuity between the tines of the plug & the appropriate contacts in the socket/bases, But when a BTL lamp is put in, it seems loose. the spring contact at the bottom of the socket doesn't seem to press reliably against the bottom contact of the lamp, thus the lamps are energized intermittently (or not at all)</div><div><br></div><div>Is there a DIFFERENT lamp that these should be using (one with a slightly deeper base) or is it possible that the ceramic socket bases need to be replaced? Some of them almost look new (as if they had already been replaced recently)...is it possible that some predecessor secured the WRONG base/socket?<br clear="all"><div><br></div><span class="gmail_signature_prefix">-- </span><br><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div>Steven J McLean</div><div>515-480-8461<br><a href="mailto:stevenjmclean@gmail.com" target="_blank">stevenjmclean@gmail.com</a></div><div><a href="mailto:smclean@grandview.edu" target="_blank">smclean@grandview.edu</a></div><div><a href="http://designandtechtheatre.wordpress.com" target="_blank">designandtechtheatre.wordpress.com</a></div></div></div></div></div></div></div>
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