STAX input voltage question

Since the voltage selector plug is lost, a former owner may have bypassed it since the amp will not receive any power if it isn't there. There are 4 primaries if I remember it correctly, two 20v and two 100v, but I could be wrong.

I don't have any of my tube amps up for sale any time soon since two of them have only been with me for a week. I can recommend the best amp for the job though based on the headphones you will be using. Any one of the Lambdas needs a pretty basic amp compared to the SR-007 Omega II. I use a EL34 based Blue Hawaii as my main amp and it is larger then many power amps but still isn't powerful enough for the Omegas so I'm working on a 845 based design.

Spritzer,

It is the 100V unit that has the voltage selector plug missing and it WILL operate. I bought that unit brand new, from a reputable dealer circa 1986. The packaging seemed factory fresh but I guess someone MIGHT have removed the plug before selling it. I can't imagine that they would have modified any internal wiring though. Also there is a very 'original' looking plate screwed over the voltage selector switch.
It is the 117V unit that will not operate with the voltage selector plug removed. Does that info change what you said before?

On the subject of a tube amp: I am considering an SRM-T1 for either my Lambda Pros or for Lambda Signature Pros that I have access to. What do you think of that combo and do you think that my 61 year old ears could hear the difference compared to what I have? I do love the detail of STAX and the sweet sound of tubes (at least when listening to McIntosh tube amps through speakers).

Thank you again so very much for all of your advice.

Since your 100v amp has a plate over the voltage selector that changes everything. Thats how Stax shipped the 100v amps back in the 80's so they could be converted at a dealer but not by an individual. The simply configured the primaries correctly and then bypassed the need for a plug. There should be the same transformers in both units, if they are the same version (A,B or C in front of the serial number), so there should be a sticker on them with the name "Bando" and then a serial number. If they match then you can hook up the voltage selector as on the 117v unit and then make the same connections internally as the plug would do. That should do it.

I have a T1, mine is modded with most of the wiring replaced with silver and WBT silver RCA jacks, and both the Lambda Pro and the Lambda Signature. The T1 is the work horse of my setup and is turned on 24/7 and it sounds great with most of the Stax models except the tougher loads such as the Omegas, Sigmas and the 4070. It is a clear step up form the SRM-1 Mk2 and it's easy to hear how much better the Lambda Signature is compared to the Pro's.

Happy to help out a fellow Stax nut.

Spritzer.....
YOU da MAN!!! Thanks again for the valuable info. All pretty good news too, if I understood correctly. I can make a lot of progress just on what you have taught me here. Would you please email me at Im2Sexy4MyOldAge@aol.com so that I might ask a quick question about price of a couple of items that I am looking at? I have more STAX questions but will let you rest a while after having put you to so much explanatory effort. lol
Thanks again....!!!

Email sent. Resting is overrated anyway.