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Homebrew Equipment A place to show, design and discuss the weird and wonderful electronic creations from the hands of individual members. |
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10th May 2020, 9:20 pm | #1 |
Pentode
Join Date: Mar 2019
Location: Monmouth, Monmouthshire, Wales, UK.
Posts: 166
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PEN 45 Amplifier.
next project....
So the question is what are the rectifier and other valve options keeping to the Mazda Octal Base. or at least Mazda theme & 4v heaters output will be PEN44 SP41 springs to mind? and could use as triode or pentode. what rectifiers were there? were there any triodes or diode triode combinations? |
10th May 2020, 9:55 pm | #2 |
Dekatron
Join Date: Nov 2011
Location: Surrey, UK.
Posts: 4,394
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Re: PEN 45 Amplifier.
UU8 is quite meaty. It'll both last longer and look better without the metallising....
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10th May 2020, 9:57 pm | #3 |
Hexode
Join Date: Mar 2012
Location: East Yorkshire, UK.
Posts: 354
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Re: PEN 45 Amplifier.
I have an Ambassador PA amplifier which uses PEN45's in push pull. Recifier is a UU6 - the pre amp and phase splitter are AC/HL's but I wouldn't recommend trying to get hold of those!
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Howard |
11th May 2020, 6:49 am | #4 |
Pentode
Join Date: Mar 2019
Location: Monmouth, Monmouthshire, Wales, UK.
Posts: 166
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Re: PEN 45 Amplifier.
I Put some NR52 one side for this project along with a couple of 354v.
I accidentally dropped a transformer in the box last week while having a tidy up. i have one left. Ho Hum. why couldnt it have been a box of EF80s. |
11th May 2020, 4:11 pm | #5 |
Pentode
Join Date: Nov 2015
Location: Maidstone, Kent, UK.
Posts: 131
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Re: PEN 45 Amplifier.
I remember my first simple audio amp was a UU8 + PEN46 combination, drove my parents wild testing with the same record (78rpm of course).
Orakle42 |
11th May 2020, 4:53 pm | #6 |
Dekatron
Join Date: Sep 2005
Location: Seaford, East Sussex, UK.
Posts: 5,997
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Re: PEN 45 Amplifier.
HL41 is a MO triode. Not that common but the HL41DD could be used.
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12th May 2020, 7:55 pm | #7 |
Pentode
Join Date: Mar 2019
Location: Monmouth, Monmouthshire, Wales, UK.
Posts: 166
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Re: PEN 45 Amplifier.
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