Heathkit V-7A VTVM

Another Goodwill find. 2 VTVM's, a heatkit tube, and a Bell and Howell transistorized.
The Bell and Howell had major problems. A blown High tolerance resistor and one of the selectors was broken, so I parted it out. The Heatkit, however is fixable, it needs new capacitors and that is all.


Nikko STA-5010

This is a Nikko STA-5010 from goodwill.

This is a tricky unit to get sound out of on the goodwill test bench. I tried getting it working in store but no luck. However I took a chance for the low price and bought it. Instead of having to just get the speakers selected right, you have to do the following to get sound out of it:
hook up your speakers
Select your speakers
set the Tape selector to Source
and then! on the back of the unit change the switch that reads "Pre & Main" to "Connect".
This is very likely the reason it was still there when I got to the store, since I saw at least 2 flippers prowling the aisles.

All Lights work.
This stereo sounds great and I am not sure why it was donated. It is clean, a little dusty inside, I used deoxit on the volume control before turning it on so I am not sure if was scratchy. Oh well mine now! I will not be doing any replacing of parts on this unless it develops a problem.


Heathkit GR-11

From Shopgoodwill.com. Needed a recap, and the 17c9 tube replaced. While cleaning it with denatured alcohol I accidentally removed the Heathkit silk screening from the front.

 Picture taken before the recap.
The unit needs an antenna but gets really good reception. Speaker is a little small. I may put it in a new cabinet later and give it a better speaker. All the plastic standoffs were broken, but I found them inside the radio and epoxied them back on.


That's some mighty fine police work, Lou

Got a call this morning at 6:15am. Unknown number. I answer and a man asks to speak with ****. I'm like "there's no **** here". He says "This number does not belong to an older woman with a walker?"

Wait what?

So somehow when the police report was made they put my number for the number that was on the note. So I gave the "detective" the correct number and we will see what happens.


Old Woman is a Thief

What is this world coming to when strange old women come to your house, fish around in your mailbox and thieve your wife's rolling crate!

Oh and before she does that she leaves a note at the base of your security door with her phone number.


Yesterday my wife comes home and discovers the rolling crate she had recently purchased is gone.
I searched the events on the surveillance system and found the following:

If you aren't interested in watching the whole thing:
she comes up our drive way. Looks at our stuff, rings the doorbell and snoops in the mailbox.

she then snoops some more and goes around to the side of the house.

she returns and writes a note that she places in our security door in a location we would have NEVER found.

She empties the crate folds it up and puts it in a plastic bag and takes off.

Today I got home about 6:30pm Called the police non emergency line. Burned a CD of the video. The officer showed up about 7:45 he was here about 30 minutes. He asked what I wanted to do? I wanted to press charges. He watched the video and wrote up a report and said that he did not think anything would come of it. I said "that's fine, since she may be doing this to other people I wanted something on file". I gave him the note and the cd. will they call the number in the note and pursue this? probably not.

So once again... as long as it is not particularly an expensive item that gets thieved, and you do not get personally caught, crime does pay.


Zenith Z374 AM/FM Clock Radio

Picked this up at goodwill. It was sitting on the test table plugged in. I did not even test.

I just bought it. I took it home and initially could not find anything wrong with it.
I did notice one major issue. FM would quit working and you would have to switch from AM to FM to get it back. Then it would drop out again.

I tested all the tubes and found that the 17ew8, and 12be6 were week. The 35c5 was intermittent and probably the reason FM would drop out. replacing all fixed the problem. The only issue remaining is that the alarm function of the switch does not work. I will have to troubleshoot that later.


Eico 377 Signal Generator

Snagged this at a goodwill for an exorbitant price. It did not work, but that was to be expected.
 It will need all new capacitors, of which I have already started working on. This thing has more electrolytic caps than anything I have worked on before.
 I counted 4 discrete caps and 2 dual section capacitors for a total of 8 electrolytic caps and 3 paper caps.
I ran out of 20uf capacitors and had to order more. I also replaced 3 out of spec resistors.


Bradford WTG 61507 AM/FM Radio

Picked this up in Prescott at an antique store. It needed all non ceramic/mylar capacitors replaced. I installed a fuse and an MP3 audio in. Still needs an alignment.
It is a Japanese made radio.
I was not able to find a schematic for it.


Bose Wave Radio Generation I Version 2

I recently acquired a 1st generation BWR from a goodwill for $8. It would only output a buzzing noise but everything else worked.
I did my research and found out the following in regards to the first 3 versions of this radio:
They are ALWAYS on. The on off button is just a mute button.
The capacitors in them are mostly low quality.
IF you get an early BWR and it works you WILL be recapping it soon.
I would recap it now as the TDA7374 can be blown out when the caps go bad.
There are more than 40 ecaps in them.
The board in my model (version 2) is prone to solder pads breaking and coming off.
look for a film on the board around the capacitors if it is there clean the board.
Replace ALL small capacitor in the unit, even on the display. You can usually skip the 10000uf main filter cap.
If your tda7374 is bad it can be replace with a tda7375. Ebay has them for $6 to $12

My impression of the sound from this radio, since I had never heard one before.
It is very good. I would compare it to a ported 2 way bookshelf speaker with a 5 or 6 inch woofer and a 2 inch tweeter.
Contrary to what I have been reading it is stereo. Confirmed with some songs with discrete channels.
The left speaker is the mid range "woofer" (and left channel) with low frequency sound channeled through a port by the right speaker. The right speaker is mid to high range as well as right channel.
A big part of the sound is the built in equalizer, I would liken its output to the "loudness" button on an older stereo or the old smiley face on a graphic equalizer.
The TDA7374 is interesting, it is a Dual Bridge audio amplifier for car radios.

My radio has an external AM antenna which has relatively good sensitivity. Newer versions have a loopstick.

I will be keeping this one as I made several mistakes working on it that I corrected but would not in good conscience sell to someone else. I will keep an eye out for them as they sell for $125+ on ebay.

Some schematics are available here.

I have read on several forums that you can also call Bose and they will send you the schematics for your radio.


Emerson 641B

Another Ebay purchase made with birthday money from my Mother-in-law. I saw one just like it in a local antique store for $40 but cosmetically in worse condition.The knobs on the one in the antique store were munged.
 Pic below taken after I removed the old filter cap.
It hummed on power up which means the electrolytic power filter caps were bad. I replaced them. 

I powered it up again and the hum was gone, but all I got was horrible static and faint KTAR 620am.
Hmm.... I then did a full recap, but the static persisted. Attempting an alignment did not improve anything. Some research makes me think that it has silver mica disease and I had to rebuild the 1st IF transformers. I replaced the power cord at this time.

Once I had the 1st IF Transformer rebuilt, I did an initial alignment and found it was still a little weak. I tested all the 6BJ6 tubes and found two were not as good as I would like. I picked up 4 NOS tubes and replaced all the ones in the radio (since the NOS ones tested better than originals). I did a final alignment, installed an audio in, and the radio works great.


3 Radios from Ebay

I got these 3 radios off of ebay Monday 8-12-2013 at 6:00pm (Birthday money from Mother-in-law). With local pickup I got them for a really low price. Met the seller at a Walmart on 19th ave and bell.

Left to right.
Zenith - 2-2034
Motorola Model AT28AH
Westinghouse Century CR-510

The Westinghouse was not working and I had to replace the multisection electrolytic capacitor since it was shorted. the Power switch would not make contact (shot of deoxit), the 35w4, 50c5, and 12av6 had burned out heaters. Did an alignment, and it seems to be really sensitive. I had it fixed by 8:00pm.

The Motorola needed only slight repair. I did an alignment on it as well.

I parted out the Zenith as it was microphoning and had lots of problems. I thought it was ugly anyways.


Sears Silvertone 8013

Got this radio off of ebay as well. I should have looked closer at the pics as there are cracks on top and bottom. I fixed them with epoxy and found a missing piece inside the chassis. I also had to epoxy the plastic pieces that the screw for the back panel screw in to. The plastic in this radio is very brittle.
 If I remember correctly this radio did not need a recap. I did replace the phono RCA jack with a 3.5mm Audio/MP3 input. Picture below is before that.
I could not find a schematic etc. for this radio on line but everything was on the bottom.


General Electric T104A

Got this off Ebay for a nice price. Needed a minor recap, and added an Audio/MP3 input on it.
 Created a replacement sticker for the back and dyed it with coffee.
It's nothing exciting to look at but was in such nice condition I could not pass it up.


Newcomb B-100 Schematics

Seems there are 2 different versions of the Newcomb B100 radio. An early one with octal tubes and a later one with 7 pin mini's. Top radios is the newer version and the bottom is the older. Right click on each picture and select "open link in new tab" for the full size version.
This is an under chassis picture of the early model
This is an under chassis of the newer model.
Here is the schematic for the new model.
Here is the schematic for the older model.
The older model is better in my opinion. Sounds better and works better.


Sears Silvertone 5009

Here is an AM radio I picked up from ebay.
It was listed as "for parts not working". The original picture showed it was very dirty. When I got it it had a bunch of problems. It took about 2 days to track them all down. I thought it had silver migration disease in the IF filters (it did not) I recapped it, I had to go through the circuit board and re-solder EVERY component. I had to tighten up and solder the tube sockets, In the process of working on it I broke a very fine wire on the oscillator coil and had to fix that. I replaced a few resistors. I took it apart and cleaned the case with simple green. I did a full alignment, and the only thing left is to fix the melted plastic on top and replace the interlock cord.


Motorola B12WA

When I was a kid we had one of these.
It died in the late 70's. I took it apart and trashed it. I found one on ebay.


Goodwill Haul

Being recently revenueless I kept busy fixing old radios and going to thrift stores and estate sales. This is a partial list of my haul for the last 12 months 7-2012 to 7-2013:

Magnavox 20mf500t/17 20" LCD TV
Shure 520DX
Line 6 Spider III amp
2 geiger counters
2 minimus 7's
2 veneered minimus 7's
WinTV-hvr 1600
Pioneer SX-3600
orphaned Mini Advent
wireless shipping scale
Technics SA-5460
supro S6606
Center Channel Design Acoustics PS-CV
Sansui 200
Optonica SA-5407
Proton 740 tape deck
Hewlett Packard 120b tube oscilloscope
Yamaha Natural sound GE-30 Equalizer
1 Optimus unknown speaker
1 Denon TU-450
2 Garrard GSS100 speakers
1 realistic mini amp
realistic mini tuner
Technics SA-GX130
Technics RS-T330R Tape deck
optimus pro-x88av
Garmin Etrex Legend
AC hookup wire
Technics SH-8055 12 channel GEQ
Technics SU-V57 integrated amp
Technics ST-S77 tuner
Technics RS-B17W tape deck
several Canon T-50 cameras
Many SLR Cameras and lenses
Yaesu FT-23R
Kenwood KT-42B
Fender Frontman 15G
Marantz SD155 Tape Deck
Optimus SA-155 "amp"
NAD Monitor Series Power Amplifier 2100 Power Envelope
Luxman Tuner Preamp TP-117 with BOTH remotes
Fisher DS-810 speakers
General Signal PC-150 line conditioner/isolation transformer
Ross Electronics Co. 2101, 8 band radio
craftsman 1/4" socket set
Technics SA-301
Yamaha A-32
Audiosource AMP One/A
Triad Bronze Powersub
Pioneer PL-115d
Kenwood KA-127
Fisher 215
Coral BX-200 speakers
Sansui 7070
Digital I.C. Color Generator
Polaris MT5500 marine radio
Sporty's E6B Flight computer
Technics ST-G5
GE el cheapo tube radio

Most Items were sold.


Lloyd's TM-75 Tube Radio Schematic

Lloyd's TM-75 Tube Radio Schematic.

 Uploaded these for anyone else who has one and needs the schematic and tube layout.
Click on each image for a larger version.


Refurbishing a General Electric C403D Tube Radio Part III

Radio is done for now. Just a few things left to do. Which may take a while.


Refurbishing a General Electric C403D Tube Radio Part II

Work is progressing on the little radio. I have the grill on the bottom. 
The speaker and speaker cloth are installed.
I located a speaker grill at Ace hardware. It is a brass plated shower drain guard. It was a huge pain to mount. there were 4 small tabs on the back to hammer down, I had to solder brass screws to the back of the "grill" which involved scratching up the surface, using acid flux and plumbing solder since rosin core would not do it. I had to modify the speaker to match the screw locations. There is the possibility that it could pop off at anytime since I do not have much faith in it being properly soldered (we will see). although it is not magnetic it seems to not be solid brass. When I scratched up the back I uncovered a nickel? colored metal.
I have attached a home made and artificially aged (with coffee) label on the back plate.

SO! what's left to do?

The transformer.
Better knob and dial.
Dial markings (dependent on dial).
Finish the back

all the above may go slow but the transformer and back will probably be done late this week or early next. Knobs would probably take sometime.