Wanted: AF126 PNP germanium transistor - UK Vintage Radio Repair and Restoration Discussion Forum

MostlyHarmless · 2nd Dec 2025, 12:57 pm

Does anyone have any AF126 germanium transistors available for a receiver restoration I am doing?

MostlyHarmless

Station X · 2nd Dec 2025, 1:05 pm

You don't say how many you require. Plenty on eBay.

Jolly 7 · 2nd Dec 2025, 2:54 pm

If AF138s might be a suitable equivalent, please drop me a PM. These are PNP transistors with four leads and are suitable for RF/IF stages.

paulsherwin · 2nd Dec 2025, 6:02 pm

Are you sure you don't mean AC126? That's a very common Ge audio preamp/driver in mid-late 60s sets before Si came in. Nothing special.

MostlyHarmless · 3rd Dec 2025, 1:11 am

Thanks Graham, I've got a leaky RF mixer that's wandering with time and heat so I'm going to replace it with a BC559B and a 6.8K resistor from emitter to base to give the correct bias, as that's apparently a good replacement that is going to be more frequency stable and lower noise than a NOS germanium AF126 and its got the added bonus of not being 7 quid for one on eBay. its also got a couple of other AF numbered germaniums in the RF chain so i may as well just replace them and reduce the drift all the way through the receiver as i can get 10 of the new silicon transistors for 4 quid

Quote:

Originally Posted by Station X

You don't say how many you require. Plenty on eBay.

MostlyHarmless · 3rd Dec 2025, 1:15 am

Thank you Jolly7, i would take you up on those AF138 but see my reply to StationX, many thanks for replying so quickly and constructively

MostlyHarmless

Quote:

Originally Posted by Jolly 7

If AF138s might be a suitable equivalent, please drop me a PM. These are PNP transistors with four leads and are suitable for RF/IF stages.

MostlyHarmless · 3rd Dec 2025, 1:18 am

Hi Paul

nope i definitely mean AF126,(from a 1966 Blaupunkt Bremen) but I've found a good modern replacement - see my reply to StationX, thanks for the reply anyway

MostlyHarmless

Quote:

Originally Posted by paulsherwin

Are you sure you don't mean AC126? That's a very common Ge audio preamp/driver in mid-late 60s sets before Si came in. Nothing special.

Station X · 3rd Dec 2025, 9:34 am

I have three AF126's which you could have had at a reasonable price, but I see you've found an alternative solution.

Quote:

Originally Posted by MostlyHarmless

Thanks Graham, I've got a leaky RF mixer that's wandering with time and heat so I'm going to replace it with a BC559B and a 6.8K resistor from emitter to base to give the correct bias, as that's apparently a good replacement that is going to be more frequency stable and lower noise than a NOS germanium AF126 and its got the added bonus of not being 7 quid for one on eBay. its also got a couple of other AF numbered germaniums in the RF chain so i may as well just replace them and reduce the drift all the way through the receiver as i can get 10 of the new silicon transistors for 4 quid

Quote:

Originally Posted by Station X

You don't say how many you require. Plenty on eBay.

2nd Dec 2025, 12:57 pm	#1
MostlyHarmless Pentode Join Date: Jun 2021 Location: Uckfield, East Sussex, UK. Posts: 223	Wanted: AF126 PNP germanium transistor Does anyone have any AF126 germanium transistors available for a receiver restoration I am doing? MostlyHarmless

2nd Dec 2025, 1:05 pm	#2
Station X Moderator Join Date: Jan 2003 Location: Ipswich, Suffolk, IP4, UK. Posts: 22,798	Re: Wanted: AF126 PNP germanium transistor You don't say how many you require. Plenty on eBay. __________________ Graham. Forum Moderator Reach for your meter before you reach for your soldering iron.

2nd Dec 2025, 2:54 pm	#3
Jolly 7 Octode Join Date: Feb 2018 Location: Southampton, Hampshire, UK. Posts: 1,127	Re: Wanted: AF126 PNP germanium transistor If AF138s might be a suitable equivalent, please drop me a PM. These are PNP transistors with four leads and are suitable for RF/IF stages.

2nd Dec 2025, 6:02 pm	#4
paulsherwin Moderator Join Date: Jun 2003 Location: Oxford, UK Posts: 30,433	Re: Wanted: AF126 PNP germanium transistor Are you sure you don't mean AC126? That's a very common Ge audio preamp/driver in mid-late 60s sets before Si came in. Nothing special.