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 Post subject: Really neat Silvertone 1019 "gift" project !
PostPosted: Jun Tue 04, 2019 5:28 am 
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Joined: Oct Mon 26, 2009 10:02 pm
Posts: 5953
Location: Indianapolis, IN
Hello All,

With all else going on, there have been some totally unexpected & great radio happenings lately !

After viewing Tom's (35Z5) posts on his Silvertone Medalist 2016 awhile back and really liking it, began searching for one or it's predecessor, the 1019. Found a 16 year old thread about a 1019 and contacted author who said he still had it in his barn and kindly offered it to me for shipping cost. It arrived today and really is a super-neat, large cordless set ! Was pretty excited, so jumped right in and completely disassembled and detail cleaned cosmetic pieces. Tested chassis and it still behaved exactly as he described in that old thread. Looking forward to getting it repaired and back together !

More to come !

John


Attachments:
ARF 1019 GIFT PIC.jpg
ARF 1019 GIFT PIC.jpg [ 198.14 KiB | Viewed 288 times ]
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 Post subject: Re: Really neat Silvertone 1019 "gift" project !
PostPosted: Jun Tue 04, 2019 12:37 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 13830
Kewl!! Excepting that it doesn't have 8 on front, looks exactly like the 2016.


I believe that's first one of those I've seen(at least first good picture)..

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Tom


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 Post subject: Re: Really neat Silvertone 1019 "gift" project !
PostPosted: Jun Tue 04, 2019 2:59 pm 
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Joined: Oct Mon 26, 2009 10:02 pm
Posts: 5953
Location: Indianapolis, IN
Thanks Tom !

Just received e-mail from Bob Rosengarten saying that it was okay to mention that radio came from him---had asked him the other day and just heard back this morning... Sure glad he kept it those 16 years being more of a tube & car radio Guy !

All cabinet parts clean, dial window ready for polish, and chassis standing up on bench ready for electrolytic replacement & troubleshooting---when time allows ! Weather beautiful here right now and need to be outdoors...

John


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 Post subject: Re: Really neat Silvertone 1019 "gift" project !
PostPosted: Jun Wed 05, 2019 5:03 pm 
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Joined: Aug Wed 26, 2009 1:50 am
Posts: 1506
Location: Mesquite NV 89027 (from Coventry, UK)
What a nice gift!


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 Post subject: Re: Really neat Silvertone 1019 "gift" project !
PostPosted: Jun Wed 05, 2019 9:16 pm 
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Joined: Oct Mon 26, 2009 10:02 pm
Posts: 5953
Location: Indianapolis, IN
Yes, Colin---it sure was ! Was really surprised & grateful when I heard back from him after several months and he offered it to me.

After taking a "before" pic of chassis, pulled the seven original electrolytics out today and am preparing to replace them now. Looked at the schematic Tom sent me of his similar, but later model 2016 and it only uses five ! So this model uses two additional 80 uF caps... Bob just e-mailed and said he'd found the SAMS and dropped it in the mail, so should have the service data for this one soon...

Stay tuned !

John


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 Post subject: Re: Really neat Silvertone 1019 "gift" project !
PostPosted: Jun Sat 08, 2019 7:07 am 
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Joined: Oct Mon 26, 2009 10:02 pm
Posts: 5953
Location: Indianapolis, IN
Got 'er done yesterday and finished "report" tonight !

Disassembled and detail cleaned all the cabinet parts. There were a few areas of stubborn residue on grille, so scrubbed vigorously but carefully with undiluted dishwashing liquid and stubby toothbrush. The cabinet is actually a very dark brown with an original somewhat flat finish, so am unable to polish out the minor scuffs and scratches. The dial window has several small white paint specks and attempted to remove with Isopropyl alcohol, but it attacked surface so let 'em stay---went over several times with Novus-2 to remove light scratching and it turned out very well. The concave chrome plated knob surrounds were somewhat cloudy and corroded, so vigorously polished with Q-tips and Mother's automotive chrome polish. Took a lot of effort, but they finally shined up well though the copper beneath is now showing through slightly is some areas.

Only cabinet flaw is a "chunk" out of bottom edge of battery compartment cover where mounting screw once went---am eventually going to make a steel strip and glue into position so it can again be attached...

The speaker and transformer wiring was coated in sticky oil from the degradation of the vinyl insulation---wiped several times with alcohol soaked paper towel pieces and now fine.

When radio received, applied power and it was dead except for a slight speaker hiss until volume turned up past halfway point where it would come to life loudly with badly distorted audio. Replaced all seven electrolytic caps and added a jumper across IFT can pins which they used as a ground path and that Tom had mentioned had been bad on his similar 2016 (resistive on this set). When power reconnected, it behaved exactly the same with no improvement. Checked voltages at the audio pre-amp transistor which had been replaced previously and all were around one volt ! The transistor was originally a 2N408 and just so happened to have a good one in parts cabinet, so replaced it. Same exact problem ! Measured all resistances in circuit and found that the volume control element was open ! Since the element served a second purpose as the ground leg in the base bias voltage-divider, the transistor was fully turned on and pulling down the collector voltage---something I'd never seen or heard of before ! Temporarily tried a 20K resistor across element and transistor voltages and function returned to normal---of course volume control still bad. Disassembled and found that the lower half of the resistive element was almost completely worn away !

Since a new replacement for the original volume control is not available and a used part (or element) would most likely have same issues, decided to make a mechanical adapter for a new 5K Japanese control. The later model 2016 used a 5k control in a more conventional amplifier circuit, so also decided to "reversibly" modify pre-amp circuit in this set to accommodate it. Unfortunately, this disabled the phono input option, but wanted to keep it as simple as possible. See schematic below to see what was done... All removed components were saved. Because the new pre-amp transistor was stressed due to bias issue and there still was a tiny bit of "hiss" at minimum volume, added socket to PCB in case replacement was needed in the future...

Removed the unique two-level flatted shaft from the disassembled control and which would be needed for the original knob and "indicator" disk. Also used the front PCB mount/shaft bushing piece. Found a small, sturdy rectangular steel spacer in one of the parts bins which was a good size to mount new control. The clearance was so tight on the PCB mounting piece that there was only room for 2-56 nuts adjacent to solder tabs and fortunately found two 2-56 X 1" socket-head cap screws in hardware stash along with two 13/16" long 1/4" brass hex standoffs. Carefully measured and drilled necessary holes in spacer and PCB mounting piece. To couple the original shaft to new control, looked through knob drawer and found a still flexible "shaft extender" for a knurled-shaft control salvaged long ago from an old TV. Cut a short length and was able to force-fit end of original shaft into it as far as necessary for clearance to front mount. Added a "compression ring" from junked knob shaft to hopefully aid retention. Because of length limit, had to very carefully shorten length of new control shaft with hacksaw blade and then bevel cut edges with file. Unfortunately, made shaft a bit too short and had to cut a small steel strip to fit within split to contact end of old shaft to keep it from pushing inward further when "indicator disk" and knob pressed on after reassembly. When assembling "adapter", had to install external shaft and coupling to new control carefully ensuring that the "flats" were straight down so that the "indicator disk" would show "OFF" when control turned off. When attempting to install new assembly onto PCB, discovered that the screw ends protruded just enough past nuts to cause interference, so carefully filed flush with small jeweler's file. After attaching to PCB and twisting mounting tabs to lock into place, used an extra amount of solder to hopefully help support the added weight. See pics below...

Wired new control in accordance with pre-amp circuit mod and applied power to test---worked fine ! Radio is super performer with both excellent sensitivity and selectivity on upper half of band, but lower end noticeably weaker. IF alignment as well as ANT & RF trimmers nearly dead-on as they were. Sound quality is outstanding with the excellent tone control circuit and "tweeter" ! The audio output circuit in this set uses 2N270 P-P pair which are higher output transistors than the 2N408's used in the later model 2016. You can turn this set up loud enough to vibrate the plastic cabinet and sound is still clear ! Would be neat to have a side-by-side comparison with Tom's 2016...

Once radio assembled, noticed that the tuning cap jammed midway. After shifting the "dial disk" in and out and loosening frame without effect, looked closely at rotor and saw that one of the blades was bent slightly (evidently by me !) and the notch was catching edge of stator blade. Carefully straightened and all now okay again !

All in all, an excellent performing (except low end of band right now), sounding, and very neat looking (to me at least) radio ! And it is a big set like Tom said of his 2016... Really like the protruding knobs especially with the silky-smooth and precise vernier tuning---very easy to tune back & forth across the band. Thanks again, Bob !

Project pics in two installments below... I was so glad to get it back together that I forgot to take one of cabinet inside.

John


Attachments:
1ARF 1019 ORIGINAL CAPS.jpg
1ARF 1019 ORIGINAL CAPS.jpg [ 228.41 KiB | Viewed 164 times ]
2ARF 1019 BAT CMPRTMNT PRTS CLN.jpg
2ARF 1019 BAT CMPRTMNT PRTS CLN.jpg [ 258.31 KiB | Viewed 164 times ]
3ARF 1019 SPEAKERS CLN FRT.jpg
3ARF 1019 SPEAKERS CLN FRT.jpg [ 366.64 KiB | Viewed 164 times ]
4ARF 1019 FRONT PNL INS CLN.jpg
4ARF 1019 FRONT PNL INS CLN.jpg [ 296.64 KiB | Viewed 164 times ]
5ARF 1019 FRONT PNL PRTS CLN.jpg
5ARF 1019 FRONT PNL PRTS CLN.jpg [ 411.36 KiB | Viewed 164 times ]
6ARF 1019 CHASSIS REAR BEFORE.jpg
6ARF 1019 CHASSIS REAR BEFORE.jpg [ 362.58 KiB | Viewed 164 times ]
7ARF 1019 CHASSIS TOP  BEFORE.jpg
7ARF 1019 CHASSIS TOP BEFORE.jpg [ 270.07 KiB | Viewed 164 times ]
8ARF 1019 BAD OLD VOL CTL APART.jpg
8ARF 1019 BAD OLD VOL CTL APART.jpg [ 289.5 KiB | Viewed 164 times ]
9ARF 1019 VOL CTL MOD PARTS.jpg
9ARF 1019 VOL CTL MOD PARTS.jpg [ 323.84 KiB | Viewed 164 times ]
10ARF 1019 NEW FABBED VOL CTL ASSY.jpg
10ARF 1019 NEW FABBED VOL CTL ASSY.jpg [ 236.77 KiB | Viewed 164 times ]


Last edited by xrhonda91 on Jun Sat 08, 2019 7:34 am, edited 1 time in total.
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 Post subject: Re: Really neat Silvertone 1019 "gift" project !
PostPosted: Jun Sat 08, 2019 7:10 am 
Member

Joined: Oct Mon 26, 2009 10:02 pm
Posts: 5953
Location: Indianapolis, IN
Here are the remainder of project pics---please see previous post for first installment...


Attachments:
ARF 1019 AUD-MOD DETAIL.jpg
ARF 1019 AUD-MOD DETAIL.jpg [ 203.87 KiB | Viewed 164 times ]
11ARF 1019 NEW-FABBED VOL CTL INSTALLED.jpg
11ARF 1019 NEW-FABBED VOL CTL INSTALLED.jpg [ 360.98 KiB | Viewed 164 times ]
12ARF 1019 CHASSIS REAR COMPLETE.jpg
12ARF 1019 CHASSIS REAR COMPLETE.jpg [ 353.81 KiB | Viewed 164 times ]
14ARF 1019 CHASSIS FRONT REPAIRED-CLN.jpg
14ARF 1019 CHASSIS FRONT REPAIRED-CLN.jpg [ 359.41 KiB | Viewed 164 times ]
15ARF 1019 CHASSIS FRONT COMPLETE.jpg
15ARF 1019 CHASSIS FRONT COMPLETE.jpg [ 241 KiB | Viewed 164 times ]
16ARF 1019 FRT PNL SPKRS & DIAL WINDOW IN.jpg
16ARF 1019 FRT PNL SPKRS & DIAL WINDOW IN.jpg [ 309.31 KiB | Viewed 164 times ]
17ARF 1019 FRONT PNL COMPLETE REAR.jpg
17ARF 1019 FRONT PNL COMPLETE REAR.jpg [ 345.45 KiB | Viewed 164 times ]
18ARF 1019 CMPLT REAR.jpg
18ARF 1019 CMPLT REAR.jpg [ 239.11 KiB | Viewed 164 times ]
19ARF 1019 CMPLT LFT SIDE.jpg
19ARF 1019 CMPLT LFT SIDE.jpg [ 119.64 KiB | Viewed 164 times ]
20ARF 1019 CMPLT FRT.jpg
20ARF 1019 CMPLT FRT.jpg [ 482.39 KiB | Viewed 164 times ]
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 Post subject: Re: Really neat Silvertone 1019 "gift" project !
PostPosted: Jun Sat 08, 2019 1:22 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 13830
Outstanding job!! Volume control repair is beyond outstanding, great ideas incorporated in replacement. Interesting yours also had the IF can ground issue.

These are exceptional radios with unique styling, and rare enough you won't see often see one.

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Tom


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 Post subject: Re: Really neat Silvertone 1019 "gift" project !
PostPosted: Jun Sat 08, 2019 2:12 pm 
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Joined: Aug Wed 26, 2009 1:50 am
Posts: 1506
Location: Mesquite NV 89027 (from Coventry, UK)
The volume control replacement is extremely impressive. Nice work!


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 Post subject: Re: Really neat Silvertone 1019 "gift" project !
PostPosted: Jun Sat 08, 2019 3:47 pm 
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Joined: Oct Mon 26, 2009 10:02 pm
Posts: 5953
Location: Indianapolis, IN
Thanks very much, Guys---Always appreciate the encouraging good words !

Would have been neat if Arvin had offered a version under their own name...

John


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