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Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets. |
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4th Oct 2019, 3:09 am | #61 | ||
Nonode
Join Date: Jan 2009
Location: Papamoa Beach, Bay of Plenty, New Zealand
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Re: Valve Items - Philips/Mullard Rimlock-to-Noval Transition
Quote:
Quote:
Cheers, |
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4th Oct 2019, 8:55 pm | #62 |
Dekatron
Join Date: Nov 2011
Location: Surrey, UK.
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Re: Valve Items - Philips/Mullard Rimlock-to-Noval Transition
Without formal data, one might (tenuously) infer that using B as the designation for "double diode" signifies that they were identical types designed to match closely in characteristics (e.g. for something that explicitly needed two matched diodes, such as a discriminator or other balanced use), whereas the separated AA might suggest two diodes that were not necessarily identical in characteristic, but that were perhaps more thoroughly screened from each other.
Straying a little from the original thread title, though. |
6th Oct 2019, 12:24 am | #63 |
Nonode
Join Date: Jan 2009
Location: Papamoa Beach, Bay of Plenty, New Zealand
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Re: Valve Items - Philips/Mullard Rimlock-to-Noval Transition
From a preliminary look, I'd ay that the miniature double diode issue warrants a separate thread, so I'll plan on starting one soon.
Cheers, |
12th Oct 2019, 4:05 am | #64 |
Nonode
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Location: Papamoa Beach, Bay of Plenty, New Zealand
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Re: Valve Items - Philips/Mullard Rimlock-to-Noval Transition
The double diode thread, "Why Both EAA91 and EB91", has been started at: https://www.vintage-radio.net/forum/...06#post1183106.
Cheers, |
14th Oct 2019, 5:15 am | #65 |
Nonode
Join Date: Jan 2009
Location: Papamoa Beach, Bay of Plenty, New Zealand
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Re: Valve Items - Philips/Mullard Rimlock-to-Noval Transition
Some sense of Philips’ general transition from Rimlock to noval types may be gleaned from the Preferred Types tabulations from a couple of Philips valve pocket books.
The first of these is Philips Electronenbuizen Zakboekje of 1953. At this time, in the 6.3-volt and 100 mA heater groups, the preferred valve positions were about equally shared between Rimlock (yellow highlighting) and noval (green highlighting) types. The second is a 1954 Pocket Book. By this time novals have displaced Rimlocks as preferred types in all but one case, namely the EL42 car radio output valve. This was replaced by the noval EL85 c.1955. Some of the Australian Innovals appear never to have been released outside of Australia, as noted below. 6AD8 (EBF81) Australia only 6AN7 (ECH80) Australia only 6BH5 (EF81) Australia only 6BD7 (EBC81) Not released in Europe until c.1954, displacing the EBC41 6M5 (EL80) Australia only 6N8 (EBF80) Released in Europe at about the same time as in Australia 6V8 (EZ80) Not released in Europe until c.1953, displacing the EZ40. Cheers, |
14th Oct 2019, 6:14 am | #66 |
Banned
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Location: Mareeba, North Queensland, Australia
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Re: Valve Items - Philips/Mullard Rimlock-to-Noval Transition
I do thank Synchrodyne for that input!!
I know intimately every valve by its Australian number. To FIND a data book with all the cross references was and remains a REAL pain. Most databooks even the Philips/Mullard books didn't list valves that way. It was required to go to the back "short" section, FIND the equivalent, then reopen at the listed alternative and go from there. I thank god for American logic in this case. It's just my take after 55 years, AT LEAST, of looking up alternatives. Joe |
14th Oct 2019, 12:15 pm | #67 |
Rest in Peace
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Re: Valve Items - Philips/Mullard Rimlock-to-Noval Transition
In Europe we have the opposite problem, as we know that the American valve names are virtually meaningless. Is a 6360 a QQV03/10 or a QQV03/20? Few American databooks even mention the European names.
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22nd Oct 2019, 5:30 am | #68 |
Nonode
Join Date: Jan 2009
Location: Papamoa Beach, Bay of Plenty, New Zealand
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Re: Valve Items - Philips/Mullard Rimlock-to-Noval Transition
Thus far I have not found any evidence that the Philips Australia Innoval valves were used in New Zealand radio receiver production.
That comment derives mostly from a selective look at the radio receivers detailed at this site: https://www.vintageradio.co.nz/. During the 1950s, the NZ radio makers made extensive use of Rimlocks and the later noval series - with their primary Pro-Electron designations, including mixed lines-up, as well as American valve types. That is not to say that cases where say one or some of the EF81 (6BH5), ECH80 (6AN7), EL80 (6M5), EBF81 (6AD8) were used will not be found with a more extensive search. The EBF80 (6AN7) was used in NZ quite early on, but this was released in Europe at the same time as in Australia. NZ use of the EBC81 (6BD7) and EZ80 (6V8) appears not to have been before those two were released in Europe. So mostly at least, NZ followed European practice when it came to the Rimlocks and European novals. Nonetheless, there was some Australian influence in NZ practice in that the 6AE8 was found in otherwise American lines-up. 6AE8 was the AWV designation for the Osram X79, which infilled what was a significant a gap in the American range, at least for setmakers who followed European precepts when it came to AM frequency changers. Cheers, |