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Sir rematzz . . . . .
Looks like "we" are being an "also ran" in your quest for repair info for this unit . . .as was being verified by:
Do read this . . . . and then remember back.
http://www.lencoheaven.net/forum/index.php?topic=21333.0
( Looks like that sets underchassis needs a dusting and vacuuming . . .Baaaaaaaaaaaaad.)
That Regentone is one nice sounding unit, that is from circa 1955-56-57, and you should be proud to have it,
and when it is properly operating, to be the envy of any younger generation observer.
Here is a photo of the Regentone factory in Elmsford, just 2 years before they started the manufacture of YOUR radio:
BTW those "mystery" electrolytic capacitor are C54 and C62 , and I have marked them on the now supplied schematic.
C54 is a summing capactor being used in the FM radio portions detector stage.
( IT would NOT be THE bottleneck,in respect to your currently experienced problem(s) )
Its fault would be weakened or distorted sound when being in FM mode.
C62 is a cathode bypassing capcitor, and its decreased capacitance would cause decreased low end bass tonal response and
a bit lowered overall gain /volume in the EL 84 Audio output stage.
BEHOLD . . . .I now present . . .your custom drafted, ONE OF A KIND schematic.
It is taking the manufacturers schematic (across the very top) which they had made as TWO separate pages, but I have now
UNITIZED it into a one page, linear, cross flowing schematic.
In the mid portion, I added your tube basing info, along with their typical expected voltages being over to the right.
And finally, a pictorial view of the units under the chassis components and their locations.
Now, grab hold and hang on tight and I will give you a rundown on its analysis, enroute to its repair.
You said that all tubes were lighting up but said that the sets EF89 IF stage tube was open from pin4-5.
So that is one that you will be needing for the radio portion to function.
HOWEVER . . . .we don't even NEED it to further test out the probable cause of no sound from the set, since
your phono SHOULD have operated, to make some sound . . . IF NOT, its cartridge's output has declined and failed you with age.
Since you have used an ohmmeter, that means that you can also use that instruments AC and DC voltage functions for
rudimentary voltage measurements in your further troubleshooting.
I believe that what is going to be, your MAGIC FIX, is the replacement of the C63, C64 and C59 main power supply filter electrolytics.
I have them marked within fine RED + YELLOW boxes.
The sets B+ power supply section starts at the V6 / Easy 80 pin3 cathode and passes up the RED arrow path to C64 where
it produces some massive ripple reducing filtering and then passes on up to the the audio output stages T1 output transformer
between its a-b windings junction and reduced voltage can flow down and out of "b" winding and down the BLUE arrow path to the EL84
or it can flow upwards out of "a" winding to R40 being used as a filter/voltage dropping resistor.Then the reduced voltage out of R40
flows down and thru R39 to provide screen voltage at the EL84 pin 9.
Take note that another significant function of R40 is to pass to the left and tie in to C63 filter cap to get even MORE filtering
of that reduced B+ supply line which goes to the LEFT and feeds voltage to ALL of the rest of your radio.
FURTHERMORE . . .then there is connection to R34 . . . which reduces the level of that B+ supply, yet a bit more and is using
C59 for its filtering.
Now go ye forth now and locate electrolytic capacitors C64----C63---and---C59, and if you track down the wiring paths to them,
I believe that you will find all three of them being contained within a "canned electrolytic".
Find my Green boxed R40 and I believe that electrolytic cans location is being the circle behind it.
On the top side of the chassis, you should be able to read the markings on that can, as to their Ufd values and voltage ratings.
One final question . . . .is if that HUMMMMMMMMMM, coming from the sets speaker, can be diminished by turning down the sets volume control.
If not . . .since I am deaf at this end . . . .is that HUMMM .... being 10 thru 90 % of the sound level you would normally listen to the radio at.
OR it COULD also be strong enough, so as to be 100% 200% 300% in excess.
Thassittt . . . .gonna let you go now and explore with a bit of your new found olde tymes ray-dee-oo knowledge.
Then . . . . . I will be asking for you to make some specific voltage measurements.
Aside adjunct observation:
I wunder whin "spell check" wil ever be larnin' hows to spels "electrolytic"
ADDENDA:
In rereading that comment of yours, on the first forum, there,you did not seem to note the hummm as being overly loud.
If that is the case, lets just jump forward a bit and have you measure the DC voltage on both sides of R40.
Have your meters negative probe connecting to any component connected to that HEAVY BLACK ground buss
Then check both sides of R40 with your meters + probe.
Main initial attention is being its lead that goes to T1 for ~260VDC and then . .AND THEN . . the other side
. . . . is it anywhere near that prescribed ~235VDC or is it down towards ZEEEERO ?
73's de Edd
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