[Heathkit] Heathkit Digest, Vol 243, Issue 6

[Robert Ward]

Hi Vince

	Thanks for the info....
I don't recall what the cost was for the extra upgrade BUT I didn't request
a vanity call. I lived in PA at the time.

		73, Bob

-----Original Message-----
From: heathkit-bounces at mailman.qth.net <heathkit-bounces at mailman.qth.net> On
Behalf Of heathkit-request at mailman.qth.net
Sent: Tuesday, December 23, 2025 12:00 PM
To: heathkit at mailman.qth.net
Subject: Heathkit Digest, Vol 243, Issue 6

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Today's Topics:

   1. SB634 voltage guide (Robert Ward)
   2. SB-634 Voltages (Robert Ward)
   3. Re: SB634 voltage guide (vince at kd7tww.us)


----------------------------------------------------------------------

Message: 1
Date: Mon, 22 Dec 2025 18:20:43 -0500
From: "Robert Ward" <nq3n at yahoo.com>
To: <heathkit at mailman.qth.net>
Subject: [Heathkit] SB634 voltage guide
Message-ID: <000101dc7399$9990b3a0$ccb21ae0$@yahoo.com>
Content-Type: text/plain;	charset="us-ascii"

Hi

 

            I'm working on my SB-634 console (clock).

I'm curious about the voltage from the (T1) main transformer.

I've measured the secondary at 170V AC and 205V DC after the rectifier.

Which to me makes no sense at all...

The filter caps and diode rectifier have been replaced .

The displays do lite up but obviously something is wrong.

 

            Any help would be appreciated

 

                        Bob   NQ3N



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Message: 2
Date: Mon, 22 Dec 2025 18:50:37 -0500
From: "Robert Ward" <nq3n at yahoo.com>
To: <heathkit at mailman.qth.net>
Subject: [Heathkit] SB-634 Voltages
Message-ID: <000c01dc739d$c73c74c0$55b55e40$@yahoo.com>
Content-Type: text/plain;	charset="us-ascii"

I just looked at the primary to chassis and see the transformer is leaking
AC to the chassis so sot good..

I'll have to look for a replacement

Would be nice to know what voltage the secondary is, so could sure use that
info..

I'm thinking the secondary HV should be 230V  to 250V

Next winding 20/24V

Last winding 13/14V

 

                        Bob   NQ3N

 



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------------------------------

Message: 3
Date: Mon, 22 Dec 2025 17:06:34 -0700
From: vince at kd7tww.us
To: heathkit at mailman.qth.net
Subject: Re: [Heathkit] SB634 voltage guide
Message-ID: <9562fb20-6279-48a2-9cf5-f66254525c98 at kd7tww.us>
Content-Type: text/plain; charset=UTF-8; format=flowed

Hi

Don't know if it matters but I found a parts unit on the Bay $67

https://www.ebay.com/itm/256698503437

hth 73

On 12/22/2025 4:20 PM, Robert Ward via Heathkit wrote:
> SB-634 console

--
-73
How much money did it cost to pick your own "two letter call" (example:
W3SY) in 1977, if you were an Extra Class licensee?



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End of Heathkit Digest, Vol 243, Issue 6
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