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 Post subject: Zenith 1000d Transistors
PostPosted: Feb Thu 13, 2014 2:24 am 
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Joined: Oct Sun 06, 2013 2:41 am
Posts: 108
Location: SW Ohio Fairfield
Just had a customer drop of his fathers 1000d and it needs transistors as all of them are missing. Does anyone have a list of the ones it needs and a source for them?


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 Post subject: Re: Zenith 1000d Transistors
PostPosted: Feb Thu 13, 2014 3:28 am 
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Joined: Aug Wed 24, 2011 4:35 am
Posts: 4893
Location: Sunnyvale CA
SWLNUT wrote:
Just had a customer drop of his fathers 1000d and it needs transistors as all of them are missing. Does anyone have a list of the ones it needs and a source for them?


That sounds very expensive. This might prove to be a cost-saver, shipping included:

http://www.ebay.com/itm/Zenith-Trans-oc ... 417ca7b3a8

There are NTE equivalents for all of them that are acceptable, but they are quite costly. Use the part numbers from the label and punch them in here:

http://nte01.nteinc.com/nte/NTExRefSemi ... f/$$Search

The only real issue is the matched pair output, but they will work OK even if they aren't perfectly matched. You can also use these:

http://www.ebay.com/itm/50-GERMANIUM-PN ... 25850d98fa

for any of the RF or IF positions. They won't work (for long) in the audio section.

But before you go to the trouble of buying something like $60-70 worth of transistors, if you have another 1000 or 3000, might want to temporarily populate the customer radio to see if there might be something else wrong with it.

Brett


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 Post subject: Re: Zenith 1000d Transistors
PostPosted: Feb Thu 13, 2014 4:20 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 12549
Location: Mpls, Minnesota
NTE POPULAR GERMANIUM TRANSISTORS
NTE
P/N TYPE APPLICATION
100 PNP Osc. Mixer
101 NPN Osc. Mixer
102 PNP Audio Output
102A PNP Driver, Output
103A NPN Driver, Output
124 NPN Si, HV Power Output
126 PNP RF-IF Amp
160 PNP RF-IF Amp


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 Post subject: Re: Zenith 1000d Transistors
PostPosted: Feb Thu 13, 2014 5:25 am 
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Joined: Aug Wed 24, 2011 4:35 am
Posts: 4893
Location: Sunnyvale CA
easyrider8 wrote:
NTE POPULAR GERMANIUM TRANSISTORS
NTE
P/N TYPE APPLICATION
100 PNP Osc. Mixer
101 NPN Osc. Mixer
102 PNP Audio Output
102A PNP Driver, Output
103A NPN Driver, Output
124 NPN Si, HV Power Output
126 PNP RF-IF Amp
160 PNP RF-IF Amp


Of these, you need the 126, 160, and 102A. I think it might also need 158s, but I will check.

Brett

p.s. apparently, you need (1) NTE126 (or Russian 416p), (4) NTE160 (or Russian 416P), and (4) NTE102A.


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 Post subject: Re: Zenith 1000d Transistors
PostPosted: Feb Thu 13, 2014 7:11 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 12549
Location: Mpls, Minnesota
Here is the cross reference chart.

http://www.transistor-repairs.com/zenit ... rence.html

Here is the chart for the 7000

http://www.transistor-repairs.com/R7000.html

Dave


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 Post subject: Re: Zenith 1000d Transistors
PostPosted: Feb Thu 13, 2014 8:43 pm 
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Joined: Oct Sun 06, 2013 2:41 am
Posts: 108
Location: SW Ohio Fairfield
He said NO!!!!! Far too much. I guess he will take it back or maybe I can get it cheap?


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 Post subject: Re: Zenith 1000d Transistors
PostPosted: Feb Thu 13, 2014 11:54 pm 
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Joined: Aug Wed 24, 2011 4:35 am
Posts: 4893
Location: Sunnyvale CA
SWLNUT wrote:
He said NO!!!!! Far too much. I guess he will take it back or maybe I can get it cheap?


Can save some money with the Russian transistors, but there's still the $32 for the audio section. Might be able to find a cheaper Russian sub for those too.

Brett


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 Post subject: Re: Zenith 1000d Transistors
PostPosted: Feb Fri 14, 2014 12:37 am 
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Joined: Oct Sun 06, 2013 2:41 am
Posts: 108
Location: SW Ohio Fairfield
I bought it off him for $25 and will replace them as I can


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 Post subject: Re: Zenith 1000d Transistors
PostPosted: Feb Fri 14, 2014 2:01 am 
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Joined: Oct Mon 26, 2009 10:02 pm
Posts: 6474
Location: Indianapolis, IN
Wonder how many of the same transistors were used in less popular Zenith sets of the same era ? Have seen a few of the "lunchbox" style sets in rough condition either sell cheaply on Ebay or have listings expire with no interest.

Worth some investigation...

John


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 Post subject: Re: Zenith 1000d Transistors
PostPosted: Feb Fri 14, 2014 1:47 pm 
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Joined: Oct Mon 26, 2009 10:02 pm
Posts: 6474
Location: Indianapolis, IN
Just saw this cheap BIN w/free shipping for a 1000-1 T/O---no pics of inside, though... If it doesn't sell quickly, you could ask for inside views to see if transistors are present...

http://www.ebay.com/itm/ZENITH-Transoce ... 51b9407dee

John


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 Post subject: Re: Zenith 1000d Transistors
PostPosted: Feb Sat 15, 2014 1:32 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 550
Location: N.E. Florida
Wow, that is a good parts radio.


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 Post subject: Re: Zenith 1000d Transistors
PostPosted: Feb Sat 15, 2014 5:34 am 
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Joined: Aug Wed 24, 2011 4:35 am
Posts: 4893
Location: Sunnyvale CA
I may have a reasonably-priced solution, once again from the Evil Empire. I found a Russian supposed substitute for the 2n2428 used in later TO 1000s for the output. They were $10 for 20 of them+ shipping. This should work as well as the NTE102A as a audio-section substitute.

If so, it looks like you would be able to re-populate 1000/3000 and probably many others for about $8 total, using the 416P for the RF/IF sections and the MP41A for audio. I don't know if Commander McDonald would approve, but we will see if it works soon enough.

Brett


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 Post subject: Re: Zenith 1000d Transistors
PostPosted: Feb Sat 15, 2014 2:49 pm 
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Joined: Dec Sun 22, 2013 5:03 am
Posts: 2382
Location: Santa Cruz mountains
Quote:
.
Wonder how many of the same transistors were used in less popular Zenith sets of the same era ? Have seen a few of the "lunchbox" style sets in rough condition either sell cheaply on Ebay or have listings expire with no interest.


They work fine, I have done this many times. I've never repopulated an entire set with them but have had quite a few TOs where some transistors have been pulled and the transistors from a decrepit 755 or similar have restored operation with no I'll effects. I burned one in once for over a week at high volume with a continuous station signal and there was no noticeable performance issues.

While we are on this tack, there doesn't seem to be any reason why transistors from a vintage Japanese transistor radio with germaniums couldn't work as well. There are tons of those out there with are in rough condition but have all the parts that can be had for almost nothing.


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 Post subject: Re: Zenith 1000d Transistors
PostPosted: Jun Wed 07, 2017 3:37 pm 
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Joined: Nov Wed 14, 2007 11:37 pm
Posts: 1639
Quote:
I may have a reasonably-priced solution, once again from the Evil Empire. I found a Russian supposed substitute for the 2n2428 used in later TO 1000s for the output. They were $10 for 20 of them+ shipping. This
should work as well as the NTE102A as a audio-section substitute.


Do you know the part no.of the Russian equivalent to the nte102 /nte102a?


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 Post subject: Re: Zenith 1000d Transistors
PostPosted: Jun Wed 07, 2017 9:20 pm 
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Joined: Mar Mon 17, 2008 5:05 am
Posts: 5910
Location: Ashhurst, New Zealand
I don't know if they use the same transistors in the TO3000 but here's the equivalents from the service manual....
Attachment:
Transistor equivalents sml.jpg
Transistor equivalents sml.jpg [ 31.08 KiB | Viewed 4618 times ]

I'm not sure about going equivalent to equivalent to equivalent and expecting the original good results.

_________________
Cheers - Martin ZL2MC


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 Post subject: Re: Zenith 1000d Transistors
PostPosted: Jun Wed 07, 2017 11:39 pm 
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Joined: Feb Wed 17, 2016 2:38 pm
Posts: 268
Location: Cottage Grove, Minnesota
Because of this thread I pulled the transistors out of a junk Zenith 710, all with Zenith numbers: 121-147, 121-146, 121-145, 121-53, 121-52, and 121-19. These all seem to cross over just fine to the TOs.

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Andy


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