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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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29th Nov 2006, 9:25 pm | #1 |
Pentode
Join Date: Jun 2006
Location: Crawley Down, West Sussex, UK.
Posts: 151
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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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29th Nov 2006, 9:53 pm | #2 |
Octode
Join Date: Jan 2003
Location: Guildford, Surrey, UK.
Posts: 1,960
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Re: Dynatron ELAN
AC127
Ron |
30th Nov 2006, 10:14 pm | #3 |
Pentode
Join Date: Jun 2006
Location: Crawley Down, West Sussex, UK.
Posts: 151
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Re: Dynatron ELAN
A BC107 works a treat. Total silence except for the wanted sounds!
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30th Nov 2006, 10:20 pm | #4 |
Retired Dormant Member
Join Date: Dec 2003
Location: North London, UK.
Posts: 6,168
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Re: Dynatron ELAN
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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1st Dec 2006, 7:53 pm | #5 |
Pentode
Join Date: Jun 2006
Location: Crawley Down, West Sussex, UK.
Posts: 151
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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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