UK Vintage Radio Repair and Restoration Discussion Forum - Dynatron Elan; transistor substitutes.

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- - Dynatron Elan; transistor substitutes. (https://www.vintage-radio.net/forum/showthread.php?t=12950)

Superhet Si

29th Nov 2006 9:25 pm

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:shrug:
Never heard of it!

Could someone suggest an equivalent transistor please? Are these types any trouble?

ronbryan

29th Nov 2006 9:53 pm

Re: Dynatron ELAN

AC127

Ron

Superhet Si

30th Nov 2006 10:14 pm

Re: Dynatron ELAN

A BC107 works a treat. Total silence except for the wanted sounds!

ppppenguin

30th Nov 2006 10:20 pm

Re: Dynatron ELAN

Quote:

Originally Posted by Superhet Si (Post 90937)

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.

Superhet Si

1st Dec 2006 7:53 pm

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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