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Vintage Test Gear and Workshop Equipment For discussions about vintage test gear and workshop equipment such as coil winders.

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Old 12th Apr 2021, 2:07 pm   #1
HBWOODY
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Default KG1 and 16K9 substitutes

What would be best to use as substitutes for these diodes and all other diodes in a Mk11 Avo VCM.
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Old 12th Apr 2021, 4:41 pm   #2
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Default Re: KG1 and 16K9 substitutes

Have you read the excellent article by Euan MacKenzie in Radio Bygones #134 Cristmas 2011 or the excellent article by Gary Tempest in Radiophile Summer 2000?

Repairs and restorations of the AVO Mk I & II are discussed there and the diodes are discussed in detail.

Soft recovery diodes like the BYW96E (now obsolete) are recommended there - the equivalent to BYW96E is BYT78 according to Vishay.
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Old 12th Apr 2021, 5:44 pm   #3
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Default Re: KG1 and 16K9 substitutes

Thanks Martin. Will get both the articles and study them. I have some BYW96E
diodes so can use them.
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Old 12th Apr 2021, 6:07 pm   #4
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Default Re: KG1 and 16K9 substitutes

I have found a copy of Radiophile Summer 2000 but I am unable to download a copy of Radio Bygones 134 from their site. Get as far as a copy in my shopping basket but payment system does not function. Anyone out there with a hard copy they could sell me?
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Old 12th Apr 2021, 6:17 pm   #5
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Default Re: KG1 and 16K9 substitutes

Here you go.
Attached Files
File Type: pdf RBdec11.pdf (3.91 MB, 63 views)
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Old 12th Apr 2021, 8:15 pm   #6
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Default Re: KG1 and 16K9 substitutes

Graham
Thank you for the PDF which is going to be a great help.
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Old 14th Apr 2021, 8:31 am   #7
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Default Re: KG1 and 16K9 substitutes

Original capacitors C2 and C3 in my AVO MK11 are 0.1uf I presume replacing them with the specified 0.05uf will be OK.
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