you might need to replace your mouse, when you start having the mouse do things you are not wanting. I may suggest a new KB too. that way, you do not have to go buy another Part for your PC! esp. if the store(s) in your area run short on Items. our stores here in the US sometimes have trouble keeping stock .

Being able to understand schematics is important, if pin 2 is internally connected to pin 5 on the 50C5 that means the "missing" resistor can be on either pin 2 or 5, it's on pin 5 in this case BTW, Jim doesn't read comments so this info is for anyone else who does.

Amazing

Hi Jim. Gee that is one confusing set of alignment instructions! You had me scratching my head but you got there in the end, that's the main thing. The Q multiplier is an interesting concept too. I had never considered that there would be any useful signal on the screen grid but, it seems, there must logically be. I feel tempted to go out to the shed and put a scope on the screen of RF tube of the Columbus 90 I'm currently working on and see what signal I get. Interesting video anyway. Cheers

Great

¿ LOL ¿

An engineering sample is a prototype unit for the engineering department. Cool!

Hi Jim. Loved that. I have a HQ 180A here and that gave me many headaches get it working. It's ok now but it took me months to get it working correctly. 73, Paul on Thailand

30:00 You have seen 8V on the 150 Ohm cathode resistor... The schematic calls for 6,5V only. The 8V you see correspond to a cathode current of 53 mA. The intended current per schematic is only 43mA. 53mA instead of 43mA, thats like 25% over So you will load down the rectified b+, thereby increasing the hum and stress on the rectifier tube. And you will also be putting more power dissipation into the primary of the audio output transformer. But since this is a "guarantee void if radio leaves workbench" fix, go ahead and redesign the radio. Philips didnt know what they were doing. You know better...

28:40 If the grid coupling cap can be ruled out and the grid bleeder resistor is not open, such a slowly creeping up positive going grid voltage is mostly a sign of either a gassy tube or grid emission. The latter often due to evaporated cathode material depositing on the grid, which in turn is often a result of an overheating of the cathode. In any case changing the tube is the way to prove it, because in rare cases dirt or degradation of the tube socket may cause external leakage paths from a screen or plate pin to the grid. That tube socket degradation and the resulting development of leakage paths, sometimes leading up to even carbon tracking, has (at least in europe) been seen frequently on sockets made from resin bonded paper (Pertinax) from the 50s. And in most cases it involved the miniturized 9 pin tube sockets in combination with the extremely hot running audio output tube EL95 (6DL5), which to make matters worse has the ground referenced heater and plate on adjacent pins.

Those old carbon composition resistors as they age are troublesome. Applying a voltage to them "heats" them up and change value, sometimes dramatically.

Jim's radio shop your Canadian flag is awesome my friend

Jim's radio shop when the capacitors gos up in valae you should chain all the capacitors my friend

Jim's radio shop it is interesting when you look up tubes in your radio book my friend

Jim's radio shop it is interesting when you look up schematics on antique radios my friend

Jim's radio shop your KZbin videos are awesome my friend

Jim's radio shop i wish you and your wife and kids and your cat 73s my friend

Jim's radio shop iam thinking about getting the XHDATA D-608WB AM FM sw wx Bt mp3 weather Alert emergency portable receiver my friend

Jim's radio shop my hobbies are painting 🖼 and listening to shortwave and ssb iam thinking about getting my Grms license my friend

Jim's radio shop i have a vintage zenith Trans oceanic transistor shortwave receiver I want to restore it let me no ware I can get Russian germanium transistors?

JIM: HOOK ONE END OF AN RCA CABLE TO YOUR BELLY BUTTON AND THE OTHER END OF SAID CABLE TO THE GRID TUBE SOCKET OF YOUR RADIO AND THE ANOMOLY SHOULD GO AWAY OH, ONE MORE THING, SIR: **YOU NEED TO HAVE ADS EVERY 5 SECONDS IN YOUR FUTURE VIDEOS: **NEW KZbin RULE!!**

Jim's radio shop you are good at restoring antique radios and alignment of antique radios my friend

Jim's radio shop the store owner antique philips tube radio i hope you chain all the capacitors my friend

Jim's radio shop the store owner antique philips tube radio is awesome my friend

46:37 seeing this wire wrapped mess of capacitors and later them flapping in the breeze with no mechanical tie points, makes one wonder why others like M.Caldeira or Robert Anderson bother with restuffing caps, relocating caps, putting in terminal strips or even going to the length of buying adapt-a-cap PCB boards... Oh wait i know why; they want to do a good job for the paying customers not just a "it will work until it is off my bench" job... I dont know what canadian law is on this, but in most civilized countries Jim, being the last one to service this radio, would be the sole one responsible for the electrical safety of this appliance. I am anxious to see what he does about the elephant in the room; the missing back cover on a hot chassis....

38:40 There is a reason Philips opted to make the first capacitor after the 35W4 tube 30uF and not 40uF or 47uF, like Jim intends to. And the reason is the inrush current and repeated peak in charge current near the top of the AC wave. It is a common misconception that this only affects the initial inrush current on a uncharged cap. As a matter of fact the choice of capacity also determines where in the raising edge of the sine wave the recharge of the filter cap sets in. A too high value cap pushes the recharge point toward the peak tip of ur sinewave, meaning that only a very short timeframe (small phase angle) remains to fill the cap up to full peak voltage. And that means a high current needs to flow to achieve that. And again, this peak current is not a one shot event, but repeats with every wave - be it half or full wave depending on ur rectifier design. So choosing the value of the first cap after a rectifier - tube or semiconductor - is walking a fine line between reducing the repetative peak charge current versus ripple reduction. You can easily watch that effect of too high of a filter cap by simulating it in Pspice/LTspice! And even if you are of a less theoretical approach, tube datasheets specify the max capacity of the first filter cap after the tube. In the case of 35W4 it is 40uF. So philips opted for a 30uF as the first cap to stay well below that limit value and thereby reduce peak charge current to ensure a longer tube life. A more knowledgeable and more dilligent tech would have opted to replace the old 30uF with a 33uF one, and at least go for 200V not 160V.

Oh brother!

Oh brother.

After all that tinkering it still works. LOL

Jim's radio shop you tell interesting stories my friend

Jim's radio shop your KZbin videos are awesome my friend

Jim's radio shop it is interesting when you look up tubes in your radio book my friend

Jim's radio shop it is interesting when you look up schematics on antique radios my friend

Jim's radio shop i wish you and your wife and kids and your pet cat 73s my friend

Jim's radio shop iam thinking about getting the XHDATA D-608WB AM FM sw wx Bt mp3 weather Alert emergency portable receiver my friend

Jim's radio shop i have a vintage zenith Trans oceanic transistor shortwave receiver I want to restore it let me no ware I can get Russian germanium transistors?

Jim's radio shop my hobbies are painting pictures 🖼 and listening to shortwave and ssb iam thinking about getting my Grms license my friend

Jim's radio shop i hope you chain all the capacitors on the store owner antique philips tube radio my friend

Jim's radio shop the store owner antique philips tube radio is awesome my friend

Jim's radio shop you are good at restoring antique radios and alignment of antique radios my friend

¿ LOL ¿

¿ LOL ¿

Jim's radio shop your sdr defined shortwave receiver with ssb is awesome my friend

Jim's radio shop your KZbin videos are awesome my friend

Jim's radio shop i wish you and your wife and kids and pet cat 73s my friend

Jim's radio shop iam thinking about getting the XHDATA D-608WB AM FM sw wx Bt mp3 weather Alert emergency portable receiver my friend

Jim's radio shop you are good at restoring antique radios and alignment of antique radios my friend

Jim's radio shop i have a vintage zenith Trans oceanic transistor shortwave receiver I want to restore it let me no ware I can get Russian germanium transistors?

Jim's radio shop my hobbies are painting pictures 🖼 and listening to shortwave and ssb iam thinking about getting my Grms license my friend

Jim's radio shop your antique Hammarlund HQ-100 A Communications receiver is awesome my friend