[TenTec] can't service the omni-VI mixer

[Wade Staggs]

*Hello All,*
*                     With way too much time on my hands. We decided to
take a look for the Mixer Board Parts. Below is what I found. Could someone
please check my work, that we are referencing the correct parts/board. This
is the Semiconductor list from the 81595 Xtal OSC - L.O. Mixer Board.*

*.................Diodes ......................*
*1. D1-D8 and D35-D44  Part # 1N4148  Available from Newark.com*
*2. D9-D22 ..... BA482 Equivalent to NTE 555*
*3. D-23 ..... Available from Newark.com*
*4. D25 .......BAT41 Available from Arrow.com*
*5. D35-D44 ..... BA482 Lot of 10 from Ebay $13.10 *
*6. D25  ..... SVC321SPA Equivalent to NTE618*

*...............Transistors .......................*
*1. Q1 ... MPS5179 ...Onlinecomponent.com for $0.90 cents each*
*2. q8 ... MPS3866 ... Alltransistors.com*
*3. Q3 Q4 ... MPS6514 realcomponents.com <http://realcomponents.com> 180 in
stock*
*4. Q5 ........2N5087 Digikey.com*
*5. Q2-Q6-Q7 ... 2N4124 Newark.com*
*6. Q9 ... J310 ... Equivalent to NTE 2902*

*................... Integrated Circuits ...................*
*1. U1 ... MC1496 ...Ebay.com ... Lot of 10 for $12.21 Free Shipping*
*2. U2 ... UDN2985 Alibaba.com 10,000 In Stock. *

*This complete Parts Search took less than 15 Minutes. If the Rig is
working but just has Noise? It seems that these available parts should be
Most Helpful. I am now just wondering what parts the factory can't get? And
maybe the NTE Equivalent Diodes will not work? But.... we have had good
luck in the past with the NTE replacements. Also, this was just a Really
Quick Google Search. All Resistors and Capacitors should be Standard parts.
Chokes, Coils and Transformers should be Good if the Rig is Operational.
The IC sourced from Alibaba.com is a Chinese Website. The minimum order is
5 pieces.*
*                      So, there are my quick search results. Nothing
further to add. *

*                                                        73 to All from
Wade/KJ4WS*



On Thu, Nov 6, 2014 at 9:04 AM, <wt4t at reagan.com> wrote:

> Sent my OMNI_VI to ten tec two weeks ago. Just was not running up to
> snuff,like it used to. Heard from them today. the rig was way out of
> alignment  and also the bandpass and bfo. They told me the noise I had in
> the rig was caused by the mixer board and that they have no parts left to
> be able to fix the mixer board. If I found another mixer board ,could it be
> swapped out for the noisy board or is there realignment going to be
> required? or other changes made to the radio.
>    If a swept,any one have a good board they would part with?
> 73
> dale wt4t
>
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