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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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Old 29th Nov 2006, 8:25 pm   #1
Superhet Si
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Default Dynatron Elan; NKT transistor substitutes.

I have just purchased a Dynatron Elan for a measly sum of 1. Problem is, the set suffers some serious noise in the output stage. The fault seems to be coming from mainly TR5 which is a NKT 775
Never heard of it!

Could someone suggest an equivalent transistor please? Are these types any trouble?
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Last edited by Darren-UK; 4th Aug 2007 at 2:42 pm. Reason: Edited in accordance with Rule C1.
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Old 29th Nov 2006, 8:53 pm   #2
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Default Re: Dynatron ELAN

AC127

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Old 30th Nov 2006, 9:14 pm   #3
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Default Re: Dynatron ELAN

A BC107 works a treat. Total silence except for the wanted sounds!
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Old 30th Nov 2006, 9:20 pm   #4
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Default Re: Dynatron ELAN

Quote:
Originally Posted by Superhet Si View Post
A BC107 works a treat. Total silence except for the wanted sounds!
Which just shows how uncritical transistor subs can be. Beware that the BC107 is only rated at 100mA while I think the NKT775 is 300mA. If it works, doesn't overheat and runs at about the right collector current then it's fine. I mentioned collector current because the bias may need to be rather different for a silicon part.
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Old 1st Dec 2006, 6:53 pm   #5
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Default Re: Dynatron ELAN

Thanks Jeffrey. The 107 seems cool and the radio sounds great. A realy nice warm sounding set this one.
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