John Linsley Hood FM tuner article/s - diyAudio
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Old 13th December 2008, 04:42 PM   #1
djsb is offline djsb  United Kingdom
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Default John Linsley Hood FM tuner article/s

Hi,
I am new to this site although I've been a regular reader.
I'm sorry to revive this topic, but does anyone have available copies of the John Linsley Hood AM/FM tuner design.
I'm an owner of the a Hart discrete phono preamp (JLH design) and would like to do some research on his tuner design.
I hope someone can help.
Thanks.

David

London,UK
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Old 14th December 2008, 11:08 PM   #2
burbeck is offline burbeck  United Kingdom
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hi David.
the FM tuner was a Phase locked Loop design from ETI they had some low quality pcbs availible for it, later Hart electronics redesigned the pcbs with cooperation from JlH and looked much better, i was tempted to buy the kit at the time but was scared off with the complexity.
i do have the old ETI mags stored away in the depths of dust somewhere but you would be better off finding someone with the later debuged Hart version.

The AM tuner was called Synchrodyne and was published in E&WW, this was also availible from Hart at the time, try to get a later Hart version of the info.

ps i ended up getting a Lartshold module for my FM, they to are now defunked

good luck with your search
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Old 14th December 2008, 11:15 PM   #3
forr is offline forr  France
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Hi DJSB,
Welcome. Send me an email, I've got the whole articles, already scanned.
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Old 16th December 2008, 11:06 PM   #4
djsb is offline djsb  United Kingdom
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Hi,
As I am currently under moderation I can't send an email.
Please be patient and after a while I will send my email address.
Thanks.

David.
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Old 16th December 2008, 11:06 PM   #5
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David, you are now free to post and email.
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Old 27th June 2009, 04:18 PM   #6
forr is offline forr  France
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The scans of the JLH's FM tuner I made has a missing page :
ETI April 1987,page 36. I recovered it so you can get it now.
Just send me an email.
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Old 1st October 2012, 06:55 AM   #7
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Default JLH 400 tuner system

I am in the process of repairing and restoring this JLH tuner, and would like to have a copy of the scanned eti article, so I can fault find with a circuit diagram.

I have the decoder part scans, but need the other 2 parts of the 3 part article.

Thanks in advance.

David.
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Old 11th October 2012, 04:20 PM   #8
rsavas is offline rsavas  Canada
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Hello David,
I suggest that you look at using a modern approach to a AM/FM reciever design, such as Silicon Lab's Si4735 & the newer Si4770 parts. The benifits are well worth it. Not sure about the design you are refering to if the front end uses a mecahanical variable capacitor or varactor diodes, but many of these components are very difficult to source these days.

Regards
Rick
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Old 11th October 2012, 06:40 PM   #9
forr is offline forr  France
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Quote:
Originally Posted by davidkou View Post
I am in the process of repairing and restoring this JLH tuner, and would like to have a copy of the scanned eti article, so I can fault find with a circuit diagram.

I have the decoder part scans, but need the other 2 parts of the 3 part article.

Thanks in advance.

David.
Send me an MP.
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Old 11th October 2012, 08:24 PM   #10
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Hello Rick, Thank you, and I will look at what you suggested, although I wasn't really looking for a new design.

This JLH tuner from what I can see just by opening the hood is a straightforward variable capacitor
am/fm job, with fairly standard chip fm demodulator, 2 ceramic if filters, and perhaps a special JLH fm decoder section around MC1310 (from memory as it's not with me right now). Also has a variable RF gain knob on front panel.

Nice little kit, well designed mechanically, and will be very interested to see how it sounds when put right.

I will post how I get on.

David.
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