[TenTec] 9420 PS Problem

[Bob McGraw - K4TAX]

Hammond Manufacturing is still in business.  I have a good friend that buys 
transformers from them for his very successful guitar amp business.  He is 
building very unique tube amps that sound wonderful.

http://www.hammondmfg.com/5cindex.htm



73
Bob, K4TAX




----- Original Message ----- 
From: "Rick W" <ve7tk at yahoo.ca>
To: <d.e.warnick at comcast.net>; "Discussion of Ten-Tec Equipment" 
<tentec at contesting.com>
Sent: Sunday, June 09, 2013 4:22 PM
Subject: Re: [TenTec] 9420 PS Problem


Many thanks Dave. I think I'm on the right track with the Digi-Key 
transformer.

73,
Rick
VE7TK

Website: http://www.ve7tk.com



>________________________________
> From: "d.e.warnick at comcast.net" <d.e.warnick at comcast.net>
>To: Rick W <ve7tk at yahoo.ca>; Discussion of Ten-Tec Equipment 
><tentec at contesting.com>
>Sent: Sunday, June 9, 2013 12:50:20 PM
>Subject: Re: [TenTec] 9420 PS Problem
>
>
>
>OK, I dug the package out
>The Transformer is a Hammond Manufacturing 226L16
>Dual Primary, Dual Secondary
>Primary is 117/234 V 50/60 HZ
>Secondary:
> Serial 16V/2.2A
> Parallel 8V/4.4A
>You will want them in series, I'm sure
>
>I hope this helps
>
>73 es gud luck
>Dave
>WA3F
>
>
>
>________________________________
>
>From: "Rick W" <ve7tk at yahoo.ca>
>To: n4py3 at earthlink.net, "Discussion of Ten-Tec Equipment" 
><tentec at contesting.com>
>Sent: Sunday, June 9, 2013 1:57:24 PM
>Subject: Re: [TenTec] 9420 PS Problem
>
>Looking at my calculations (assuming 0.7 V drop on each diode):
>
> (12.6 VAC * 1.414) - (2 * 0.7) = 16.4 VDC at the regulator.
>
>When you add in any capacitor ripple I think this is pretty close to the 
>margin. I think you are right Carl. I need closer to 18 VDC at the 
>regulator.
>
>A 16 VAC transformer would give me 21.2 VDC and that is well within the 
>specs of the 7815.
>
>I have found a dual primary (115/230 VAC) transformer with 8/16 VAC out at 
>5.4/2.7 amps (parallel/series ratings). The physical size is close to the 
>original (Digi-Key P.N. 237-1261-ND). Cost is $11.14 CAN plus shipping and 
>taxes.
>
>73,
>Rick
>VE7TK
>
>Website: http://www.ve7tk.com
>
>
>
>>________________________________
>> From: Carl Moreschi <n4py3 at earthlink.net>
>>To: Rick W <ve7tk at yahoo.ca>; Discussion of Ten-Tec Equipment 
>><tentec at contesting.com>
>>Sent: Sunday, June 9, 2013 8:57:58 AM
>>Subject: Re: [TenTec] 9420 PS Problem
>>
>>
>>It's most likely at least 18 vac output on the transformer.
>>
>>Carl Moreschi N4PY
>>121 Little Bell Dr.
>>Hays, NC 28635
>>www.n4py.com
>>
>>On 6/9/2013 11:10 AM, Rick W wrote:
>>> Steve and Dave thanks for getting back on this.
>>>
>>> I was wondering if either of you knew the transformer output 
>>> specifications. I'm guessing it is around 12.6 VAC at perhaps 1 amp or 
>>> so. (The regulator is a 1-amp 7815.)
>>>
>>> It is an interesting design with the transformer on 24/7 while AC power 
>>> is applied. I shut off AC to all my supplies with a Master switch in the 
>>> station at the end of each day.
>>>
>>> Interesting that the T-T replacement is not an exact match. Digi-Key has 
>>> several in stock and their delivery time to my QTH is amazing. Just want 
>>> to be close to the original in voltage and current rating.
>>>
>>> Thanks for the surge suppressor tip bob. I'll look into it.
>>>
>>> 73,
>>> Rick
>>> VE7TK
>>>
>>> Website: http://www.ve7tk.com
>>>
>>>
>>>
>>>> ________________________________
>>>> From: Steve Hunt<steve at karinya.net>
>>>> To: Discussion of Ten-Tec Equipment<tentec at contesting.com>
>>>> Cc: d.e.warnick at comcast.net; Rick W<ve7tk at yahoo.ca>
>>>> Sent: Sunday, June 9, 2013 7:35:20 AM
>>>> Subject: Re: [TenTec] 9420 PS Problem
>>>>
>>>>
>>>>
>>>> Mine failed 9 years ago and I fitted a £15 replacement from 
>>>> RS-Components here in UK. Not much help to you as the part is no longer 
>>>> available :(
>>>>
>>>> It's worth noting that transformer is powered 24x7x365 if you leave
>>> the 9420 plugged in to a powered wall socket.
>>>>
>>>> Good luck in your search.
>>>>
>>>> Steve G3TXQ
>>>>
>>>>
>>>>
>>> _______________________________________________
>>> TenTec mailing list
>>> TenTec at contesting.com
>>> http://lists.contesting.com/mailman/listinfo/tentec
>>>
>>
>>
>>
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