Kreisler 11-81A. Identification of components and uses. - UK Vintage Radio Repair and Restoration Discussion Forum

Hammer_51 · 7th May 2021, 1:21 am

Hi all. I have a Kreisler 11-81A 50's AM radio. I have two components that i do not know about,

I have attached a photo.
I think they are capacitors but i cannot find any information online about these. Can anyone help me please and tell me what they are and what they are used for. They are connected to the IF oscillator from the detector tube 6AN7 on connection point-9. Another problem is they are not marked on the original schematic. Please help. Thanks.

Station X · 7th May 2021, 7:14 am

They are capacitors and don't need changing. The top one is variable by turning the screw through the centre?

Peter.N. · 7th May 2021, 10:35 am

'Tubular ceramics'

Peter

Station X · 7th May 2021, 10:46 am

Circuit available here:-

https://www.radiomuseum.org/r/kriesl...ic_11_81a.html

Quote:

Originally Posted by Hammer_51

They are connected to the IF oscillator from the detector tube 6AN7 on connection point-9.

C4? described as a wire trimmer.

ms660 · 7th May 2021, 10:46 am

The capacitor identified to the left is the oscillators grid coupling capacitor, it's value in conjunction with the 47k resistor determines the -ve grid voltage on the oscillators grid, that voltage also determines the bias voltage for the mixer and IF amplifier via the 10meg resistor.

The other capacitor looks to be a "wire" capacitor and might be the oscillators trimmer capacitor (C4)

EDIT: Post crossed.

Lawrence.

7th May 2021, 1:21 am	#1
Hammer_51 Diode Join Date: May 2021 Location: Corlett, New South Wales, Australia. Posts: 2	Kreisler 11-81A. Identification of components and uses. Hi all. I have a Kreisler 11-81A 50's AM radio. I have two components that i do not know about, I have attached a photo. I think they are capacitors but i cannot find any information online about these. Can anyone help me please and tell me what they are and what they are used for. They are connected to the IF oscillator from the detector tube 6AN7 on connection point-9. Another problem is they are not marked on the original schematic. Please help. Thanks. Attached Thumbnails

7th May 2021, 7:14 am	#2
Station X Moderator Join Date: Jan 2003 Location: Ipswich, Suffolk, IP4, UK. Posts: 21,289	Re: Identification of components and uses. They are capacitors and don't need changing. The top one is variable by turning the screw through the centre? __________________ Graham. Forum Moderator Reach for your meter before you reach for your soldering iron.

7th May 2021, 10:35 am	#3
Peter.N. Dekatron Join Date: Jul 2008 Location: Charmouth, Dorset, UK. Posts: 3,601	Re: Identification of components and uses. 'Tubular ceramics' Peter

7th May 2021, 10:46 am	#5
ms660 Dekatron Join Date: Apr 2011 Location: Cornwall, UK. Posts: 13,454	Re: Kreisler 11-81A. Identification of components and uses. The capacitor identified to the left is the oscillators grid coupling capacitor, it's value in conjunction with the 47k resistor determines the -ve grid voltage on the oscillators grid, that voltage also determines the bias voltage for the mixer and IF amplifier via the 10meg resistor. The other capacitor looks to be a "wire" capacitor and might be the oscillators trimmer capacitor (C4) EDIT: Post crossed. Lawrence.