My first vacuum tube radio (to repair) Let's take a look!

[@vintagetransistorRadio.Radio.h]

Thanks for sharing. Take care from India 🇮🇳 ♥️

[@rkmklz7562]

My Grandmother had one of those on the refrigerator...i remember using it in the 1970s... can't believe I am sending this 😮

[@rkmklz7562]

I love old radios... especially Multi Bands

[@andygozzo72]

one thing to watch out for in valves/tubes is 'grid emission', in valves with many hours use, mostly in power output valves but 'can' affect signal types, after a few minutes run the first grid can tend to go positive or 'less negative' resulting in excessive anode current, causing eventual damage to other compinents this doesnt always show up with any effects on the audio except when it gets severe...this 'issue' is not commonly known of or mentioned in servicing books 'back in the day', some class it as 'insulation leakage', which can also occur, but grid emission is where the electron emission coating slowly 'boils off' and deposits on the grid, so making it a very weak cathode, so causing some current flow to anode/screen, the small 'all glass' valves seem to be more affected than the larger types, likely due to closer electrode spacing ..... so its always a good idea to measure these grid voltages after a few minutes run to see if any may be afflicted, if the earlier stages afflicted, it may result in gain/volume dropping off

[@jagmarc]

If suspect a B+ HT supply filter cap can measure it in situ,. With tubes it doesn't need "low esr", just have the uF. Can patch in a trial cap across the old one with foot long wires. Most likely more than half the electrolytics are fine for another 60 years. Incandescent light bulb great for discharging any HT.

[@Thanson199415]

Thanks ill try some trial capacitors to find the bad caps

[@jagmarc]

@Thanson199415 doesn't have to be the same value. I.e. if a 16 uF has gone open you could hook anything more than 4.7 uF or more within reason

[@jagmarc]

Oh and a heater-cathode short can cause havoc.

[@Thanson199415]

And I'll check if there's any continuity between the heater and cathode on all the tube's, i appreciate your advice 😁

[@jagmarc]

You could do with a small 1:1 primary/secondary solation transformer. It makes life much easier. With one you can ground the chassis while using a grounded line powered scope.

[@ludmilascoles1195]

You spent 20~25$ to much, these usually go for 5 to 10 at hamfests or radio club auctions/meetings. I suggest you join your local club lots of help and good source of stuff to repair😂 and spare partsband saftey advice. by the way all AM and FM radios are superhytrodyne tube or otherwise. As well electrolytic caps thoug the may be covered in paper are not paper caps, the paper caps are the coupling caps between stages. You are also playing a very dangeous game playing with a hot chassis radio that is not hooked up to an isolation transformer.

[@Thanson199415]

@@ludmilascoles1195 yeahhhh I knew i was doing that 😆😂 I will be safe next time