PAS3 blend switch anyone ?

I have come to possession of a badly treated PAS3X
It can be resued, but i need the blend switch to complete
this. Anyone that has one to sell/exchange parts ?

Part number #331001 in dynaco PAS-3X manual
I live in sweden.

Thanks for reading.
peter h

maybe here (near the bottom of the page):

https://www.erhard-audio.com/Accessories_Kits.html

New2Tubez wrote:maybe here (near the bottom of the page):

https://www.erhard-audio.com/Accessories_Kits.html

No, that seems to be the input selector.
The blend switch is more complex

He may be able to help. Holger is a good guy.
Good luck in your search.

This guy has a control kit that includes a blend switch. The blend switch does operate differently, providing 6 steps of blend. Sometimes Ebay has them.

https://dynacodesigns.wordpress.com/dynaco-design-products/

If you can't find one, PM me with a Email address and I will send you a schematic to use a standard 4P6P switch to make a blend switch like the original one.

I am willing to pay for switch and postage. As i try to restore to original controls an original would be preffered.

My only other suggestion is to go ahead and restore the unit sans the blend switch (put a dummy switch in the blend switch location for appearance). You may find out that you need other parts like the hard to find bass and treble controls. By then someone here may come up with one for you. I will on the lookout for one.

jwb474 wrote:My only other suggestion is to go ahead and restore the unit sans the blend switch (put a dummy switch in the blend switch location for appearance). You may find out that you need other parts like the hard to find bass and treble controls. By then someone here may come up with one for you. I will on the lookout for one.

Thanks, that's my plan.

Hi Peter,

I have often enjoyed your very helpful Dynaco posts. Thanks very much!

In 2002 i removed the PAS-3X blend-switch because i viewed it as potential 'impurity' in the
totsig (total signal path) and the signal is much lower at blend-switch (prior to 12AX7 amplification).
I dislike wafer pots, switch contacts etc that I cannot internally clean. 60 year old metals often have corrosion inside.
I do not use Deoxit as many do----i prefer 99% isopropyl alcohol in precise spray bottle.
I do like original look but I think PAS-3x bass,treble pots & blend-switch holes make good air vents
especially if you drill similar air vent holes in steel base-plate AND install 1in decent rubber feet to elevate&isolate.
Those PAS hard plastic short feet are terrible.

In one minor way i disliked my blend-switch removal:
in addition to my 2 living-room speakers I had a large 3rd speaker in backyard for summer fun
running 10AWG speaker wire 75ft under house.
I used male/female 1/4in plugs for switching to/from outdoor speaker but that just gave 1 mono channel
to outdoor speaker (choose R or L)
If you keep your blend switch then any 3rd speaker sound could be a blended(R+L) rather than just mono.

Note: I am VERY biased in favor of minimal signal path.
One can easily see the intentions of PAS-3X high filter, bass&treble pots, blend-switch.
personally I only want balance & volume controls "less=more"

On my PAS-3X at 75% clockwise VOL rotation I still have minor undesirable R&L blending.
my goal is usually to maximize R&L separation so I spent time with wire-routing to avoid
R&L blending. I suspect the unwanted R&L blending occurs inside tape/source switch or Vol or Bal controls.

best regards,
setu

Peter,

I apologize for suggesting that you abandon your plans to do a restore-to-original.
I am biased.
I do appreciate your wanting it to be authentic---I keep my 1969 Dodge Dart convertible as
original as I can.

However I do not see how you can keep your PAS-3X 100% original AND operating well.
As you know many say the toxic selenium rectifier MUST be replaced.
and 60 year old electrolytics!
my PC-5 & PC-6 resistors were 10---25% increased over 50 years.
What to mod/replace when considering originality?

Interestingly our forum sponsor once explained why they do not offer PAS boards etc.

I love my PAS-3X for the nostalgia and Dynaco rebuild experience it gave me.
Perhaps the PAS is already in a museum somewhere?

ps: i bought a "Dynaco" tshirt on ebay recently,
my huge improvement to my Dynaco tube system was Dynaudio S40 speakers
(i read that ancient Dynaco A25 speakers used Dynaudio drivers)

best regards,
setu

I finaly got a blend switch from a fellow in sweden. With that the PAS3X is complete.