This set is about as close as we can get in Oz to a pre-war TV in the UK!
It would have been around for the start of TV in Australia and almost certainly would have shown the 1956 Olympic games.
I haven't even taken the back off it yet but my friend who sold it to me assures me its original AWV 17HP4B CRT is good.
He did say the IF gain is very low and that will need attention.
This is the only TV I've ever come across that's fitted with a number of UK-made Ediswan valves. Set makers here in the 50's and 60's would have been desperate to have to import valves because of the import duty on them.
The tuner is fitted with a 30L1 in the RF socket and a 30C1 in the mixer/osc. The IF is populated with 6F12s.
Are any of these still available in the UK?
Actually I'm not too worried because the pinout of the RF amp is virtually the same as a 6CW7 (ECC84?) and the 30C1 seems to be pin for pin for a 6BL8 (ECF80).
The 6F12 seems to be very similar to a 6BZ6 or a 6CB6 (EF??) except G2 and G3 are reversed.
A pretty TV this ain't! But it has history.
@irob2345 It has a very HMV look about it. The 6F12 is equivalent to the EF91 which was a very common valve in the UK. It has lots of other ID numbers depending on who made it including some military CVxx numbers. The Mullard ones have a nice blue coating on the inside of the glass to prevent the glass being bombarded and releasing gas as the anode didn't extend all the way around so a few Electrons slipped through!
Someone like Langrex will have those valves, but most likely badged as Mazda rather than Ediswan - Ediswan being the 'export' brand.
Seems an EF91 is a 6AM6. Thanks for the tip!
https://www.tubedepot.com/products/6am6-ef91
"It has a very HMV look about it."
Funny, right at the end of the B&W TV era HMV had a model sharing connection with Healing.
Here is the HMV of the same vintage:
![Finished job]](https://www.radios-tv.co.uk/wp-content/uploads/wpforo/attachments/1200/17250-Finishedjob.jpg "Finished job]")
@irob2345 Langrex in the UK have over 25,000 EF91s in stock but amazingly, not a single 6F12. I think 6AM6 was the designation used by Cossor.
Thanks for the Langrex reference.
I checked their price for EF91 but Tube Depot in the US works out less than half price for me.
I'll check my stock of 6BZ6 and 6CB6 first though. If I have them I may swap the 2 pins in the chassis and use them, as subsequent model Healing TVs in Oz did.
Should work better. The 6BZ6 has a remote cut-off characteristic so is ideal for AGC controlled stages. The 6CB6 is a sharp cut-off valve for following stages and has more gain than the 6AM6.
