R1155 Receiver Part 2 - Component and Wiring Clean Up

[@radio-ged4626]

Putting one tenth of the HT voltage on the Jones plug and checking the plate and screen voltages is a great idea and one which I shall employ when I finally test my R1155 receiver. Thank you.

[@MIKROWAVE1]

A mouse got into mine and now i'm looking at troubleshooting! Rats love a bit of them!

[@richardnalisnick462]

You have better patience than I do. I have been a service tech for over40 years and own and have restored every things from the Teen,'s to the 70's including many prewar and post war electro static TV Sets. Also a lot of Broadcast Transmitters. I would of never went neat that radio. Great Job! Keep up the good work. KC3NBN

[@acestudioscouk-Ace-G0ACE]

Really nice to see how a job like this should be tackled. Especially nice for a Brit like me to see this old lady come back to life. I have an RCA 88D I hope to do the same with... when I've learnt enough.

[@clifffiftytwo]

I enjoy your clear, methodical approach. I'm building my confidence to take on a classic 30s radio I've had several years. A fascinating hobby -

[@peterfarmer1592]

Thank you, I had and used the R1155 back in the sixties. Lovely to see one again. I paid £2/10shillings and used it through my teenage years. I was not licensed then just a shortwave listener. 73s G1UOD.

[@cny02253]

Outstanding! The tip to voltage test HV circuits at 1/10 voltage may well keep a person new to HV or tube equipment from getting their bell badly rung! Kudos.

[@SINCLAIRRESEARCH]

just come upon your site , ive gotton three of these little critters so will be watching your videos with interest , when i was young they on ly cost £10 second hand now they are a lot more .

[@Yarz01]

Appreciate the vast knowledge you impart on us.

[@MickLBrad]

It is always painful to come behind someone else and clean up their mess as well as perform normal troubleshooting tests and repairs. Before applying full power to a set, I used to insert all tubes except the rectifier and then turn it on (providing it is a tube rectifier and not silicon diodes.) Good luck with the rest of the restoration! 73 - de Mick, WB4LSS

[@MauriatOttolink]

That cathode resistor for the 6V6 looks like it has a fuse soldered across.Wonder why? Unless it's a blown fuse to assist the construction?

[@rick601a]

Looking at the schematic is L23 needed to operate without the DF ? . I'm looking at a radio that is missing L23 and just little confused as it looks to be not needed just wanted to get your thoughts on it before I purchase it. As this transformer might be hard to locate if needed.. Thanks

[@rick601a]

Noticed that the jones plug that was originally used in the aircraft is labeled to match the radio correctly. The jones connectors sold in US are numbered in opposite order

[@johncliff5417]

I am really getting hooked into your testing and modification of the old R1155 RX there. I feel the need to strip down an old piece of gear and do some leakage/ resistance checks. At least I would be able to see what I was doing just with my normal reading glasses on .I hate having to setup God only knows what magnification to read SMD components never mind trying to de-solder them without loosing some of them . 73 de John - G0WXU.

[@dictare]

Great series!

[@DAVIDGREGORYKERR]

You could have used Raytheon Wire-Ended vacuum tubes and maybe get it working on 24V HT on the plate and 3V on the heater.

[@MauriatOttolink]

David Gregory Kerr Quite true... Could have got some busted tubes, stripped off the octal bases to make adapters to plug those wired valves (tubes). Have to be careful. The entire chassis is about 40-50 volts BELOW the B- level as part of the valve biasing system. Can easily get into a bit of a problem, Changing the HT volts might deprive something else of a negative voltage supply. AND the "Magic Eye" tuning indicator wouldn't be at all pleased to lose itS B+ AND have an extra 12volts jammed up its heater orifice!

[@elvisburgerking8675]

I decided to restore an R1155, actually to make 1 good one out of 3 parts ones. The R1155 is a British made constructional nightmare, this thing is impossible to work on, near enough impossible to disassemble and impossible to put back together again. Perhaps it was to stop the Germans from reverse engineering it, then again I doubt they would ever want to. How they were originally constructed is beyond belief or comprehension, someone , somewhere just decided to make it as difficult as possible to build, it makes working on Japanese monster receivers seem like child's play. I couldn't decide if I wanted it just to look original, or if I wanted it fully working, I decided to go for both at the same time, and also restore the DF section and add all the filter mods that were later officially done by the Air Ministry. and just for laughs, i thought it a good idea to start with a bare chassis and gradually add bits from the other 2 radios. Quite an ambitious project I thought, only to soon realize it's bordering on the impossible. You are either an electrical genius with the dexterity of a contortionist or a sadistic psychopath that set out to deliberately make the impossible seem relatively easy. needless to say I haven't finished my project yet, not even close. however I haven't given up on it totally either. each rainy day it get's a little closer to completion.

[@MauriatOttolink]

Anybody restoring an 1155 must be aware that the IF is 560 Khz and importantly that DC ground is NOT chassis! NOT chassis. Put it another way. Chassis is not at DC ground. potential. Chassis is about 40/50 volts below ground... The biasing system can easily become compromised. It is of course, RF ground. If the B+ WAS accidentally applied to heaters, it couldn't have delivered enough current to blow 6 or 7 heaters at 300 mA each .. over two amps . Ah.... I see you refer to the chassis NOT being ground potential later in the video. The B minus /HT neg travels around on a 'rail'.

[@MIKROWAVE1]

The fun of these old sets! Can we agree at least, that it is RF Ground? The biasing cleverness in making a single HT supply deliver both Negative Bias and Positive for the screens and plate made for some clever voltage divider systems.