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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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14th Jun 2017, 10:55 am | #1 |
Dekatron
Join Date: Mar 2005
Location: Gateshead, Tyne and Wear, UK.
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Mazda 30PL1/PCL83
Found this Mazda 30PL1. It's all too evident it is not a 30PL1 and is simply a relabeled PCL83 made by Mullard.
Thorn Electrical Industries started to use AEI Mazda valves in 1963 after their acquisition of the AEI valves and tubes division. TEI also acquired Brimar from STC. The BRC 850 series used the Mazda 6/30L2. The 900 series used the 30PL14 and the 1400 series employed the 30FL1 and 30PL1. In the 1970s Thorn-AEI gave up making consumer electronics valves and Mullard made the replacements. We've all seen the Mullard 30FL2 which is a modified PCF80 but this is first Mazda 30PL1 I've seen like the example shown in the attachment. DFWB. |
14th Jun 2017, 1:35 pm | #2 |
Dekatron
Join Date: Aug 2013
Location: Wigan, Greater Manchester, UK.
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Re: Mazda 30PL1/PCL83
I never thought of using a PCL83 to replace a 30PL1 valve, but valves 50 years ago were easy to obtain.
Have you any idea of why the numbering system on the 6/30L2 didn't conform to Mazda's normal numbering, I.e. Why the 6/ in front of the valve? Appreciate it's a 6.3 volt heater but they don't show the heater voltages on other 30 series valves. Frank |
14th Jun 2017, 2:56 pm | #3 | ||
Dekatron
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Re: Mazda 30PL1/PCL83
Quote:
Quote:
DFWB. |
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14th Jun 2017, 3:18 pm | #4 |
Dekatron
Join Date: Aug 2013
Location: Wigan, Greater Manchester, UK.
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Re: Mazda 30PL1/PCL83
Hi David,
The PCL83 valve and its other heater variations were not my favourite valve, luckily not many pieces of equipment I fixed had them. I must have missed the posts about using the 30PL1 in place of the PCL83. Thanks for the info. Frank |
14th Jun 2017, 3:40 pm | #5 |
Dekatron
Join Date: Mar 2005
Location: Gateshead, Tyne and Wear, UK.
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Re: Mazda 30PL1/PCL83
I believe that the PCL83 is unique to the UK and was never used in Continental equipment. Never seen a PCL83 marked as "foreign made" and of course the 30PL1 is a truly British valve. 30PL1 is a beam tetrode.
DFWB. |
14th Jun 2017, 4:16 pm | #6 |
Heptode
Join Date: Apr 2003
Location: Ayr, Ayrshire, UK.
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Re: Mazda 30PL1/PCL83
I've often wondered - given the power rating of a PCL83 - why Mullard 'shoe-horned' that valve into an envelope about the same size as an ECC83.
The original Mazda 30PL1 was a lot taller and probably more reliable as a result, unlike the short one you've shown above David. Andy |
14th Jun 2017, 4:21 pm | #7 |
Hexode
Join Date: May 2005
Location: Wigan, Greater Manchester, UK.
Posts: 479
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Re: Mazda 30PL1/PCL83
I'm sure that the ECL80 was sometimes used in place of the PCL83, not recommended, but it did work.
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14th Jun 2017, 4:27 pm | #8 |
Rest in Peace
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Location: Solihull, West Midlands, UK.
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Re: Mazda 30PL1/PCL83
Mazda obviously liked the triode in the 6/30L2 because the same design was used in a number of other valves, often combined with a pentode such as the 30PL1. Mullard seemed to take the opposite view, with their combined valves often using unique triodes until finally they put half an ECC83 in the ECL86.
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14th Jun 2017, 10:21 pm | #9 |
Dekatron
Join Date: May 2008
Location: Derby, UK.
Posts: 7,735
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Re: Mazda 30PL1/PCL83
You can just about use an ECL80 in place of a PCL83 if the cathodes are commoned. The ECL80 (6V3 / 300mA heater) has a shared cathode and separate suppressor grid. The PCL83 (12V6 / 300mA heater) has separate cathodes and the suppressor grid tied internally to the pentode cathode, but the pinout is otherwise the same.
It won't do the valve any favours, but that substitution has probably saved a few test matches!
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20th Jun 2017, 10:18 pm | #10 |
Dekatron
Join Date: Dec 2007
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Re: Mazda 30PL1/PCL83
I can't see in the picture unfortunately, but I'm wondering what the small print code is on that valve.
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