IVLM1-1/7 versus IV-26 Type I tubes
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Dman777
Jun 21, 2015, 1:57:48 PM6/21/15
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What is the difference between the IVLM1-1/7 and IV-26 tubes type 1 tubes? They look the same but the IVLM1-1/7 are more expensive.
Terry Kennedy
Jun 22, 2015, 3:41:08 AM6/22/15
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On Sunday, June 21, 2015 at 1:57:48 PM UTC-4, Dman777 wrote:
What is the difference between the IVLM1-1/7 and IV-26 tubes type 1 tubes? They look the same but the IVLM1-1/7 are more expensive.
The IV-26 are longer (112mm base to nipple) than the IVLM1-1/7 (78mm). The 26 has slightly oval dots (actually clipped circles) on a clear substrate while the 1/7 has true round dots on a white substrate.
Both seem to have been manufactured by ORZEP (Orel). There are some overlapping date codes, but the earliest date I've seen is on a 1/7 and the latest date is on a 26. All of the 1/7 dates I've encountered have been the older Roman numeral month form (IX-83), while 26's have been dated both that way and the newer 8903 YYMM style.
The brightness curve on 26's is pretty bad - they don't hit full brightness for a few hundred hours (before that they're oddly streaky and uneven) and they start fading noticeably after some thousands of hours. I'm not sure about the 1/7, as I've never powered one on for long enough to tell.
Petro Vodopyan
Jun 22, 2015, 3:54:42 AM6/22/15
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Just to compare physical dimensions
С уважением,
Петр Водопьян
+38 066 55 78 780
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Alex
Jun 22, 2015, 4:01:03 AM6/22/15
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From the photo Petro posted it looks like the 26 has round circles on a clear background, while the 1/7 is clipped on white?
Terry Kennedy
Jun 22, 2015, 11:01:05 PM6/22/15
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On Monday, June 22, 2015 at 4:01:03 AM UTC-4, Alex wrote:
From the photo Petro posted it looks like the 26 has round circles on a clear background, while the 1/7 is clipped on white?
All of the IV-26 I've seen have had the clipped circles:
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