I do not have the carrycase, but bought the battery NOS a few years back, altough never used them. IMHO this is a very good amp to demonstrate the STAX sound if you have to bring your phones.

Dear Forum, I have a quad set of NOS EL34 tubes for sale that I had bought from eBay a few years ago. They were bought for my Dynaco ST70 that I've sold recently, so I do not need them anymore. The original German seller listed these as a matching set, but I do not have the equipment to verify...

Since then, I managed to get a NOS battery pack for 133$ with box. I think this is still a very decent mobile amp!

BUMP

* * * Sale's pending * * * Here, I am putting up a listing for a pair of STAX Sigma Pros. Exceptionally open and airy sounding headphones, a signature of all Stax headphones. The cosmetic condition is very good. The left driver was replaced at some point, it has no effect on the function. Also...

I’ve recently acquired a set of very old SR-Lambda (serial number is around 2000) in a very good condition, but the continuity of the cabling next to the strain reliefs are broken. The sound is flawless except that some static can be heard when I am moving my head. My question is that if it is...

Dear Forum, I’ve recently acquired a set of very old SR-Lambda (serial number is around 2000) at a very good condition, except one thing. The continuity of the cabling next to the strain reliefs are broken. The sound is flawless except that some static can be heard when I am moving my head...

thank you for your reply. I will check it immediately!

Dear Forum!   I am writing if anybody could help me with a little technical help, I don't know if I'm knocking at the right door... I am now about to remove the old and put some new dustcover into my Quad 57's panels.   I am asking what kind of cellotape should be used for the procedure? I...

Dear Forum!   I am writing if anybody could help me with a little technical help. I am now about to remove the old and put some new dustcover into my Quad 57's panels.   I am asking what kind of cellotape should be used for the procedure? I can source 50mm wide PP, PVC, BOPP tapes, but I...

Dear Forum,   I've acquired a set of SR-5 earspeakers. I am aware that there are different versions available (New, Gold etc.) and I am asking that how can one's determine which version is which? Mine is white (now it's rather yellow due to it's age), and the tag boards are rather silver than...

I use this circuit as a power amplifier

I had the opportunity to test the SRD6SB. I think it has a performance that is highly competitive compared to my SRM-XPro

In my opinion, those are that ceramic capacitors those hold that charge until they discharge by leaking or something. 

Thank you for your help!

    This is a self-biasing transformer for earspeakers, the SRD6 SB. I am no tech, but I see only HV ceramic caps, and there are no batteries

Thank you for the useful information. I checked the schematics on the internet and I've only seen some high voltage capacitors, no batteries. I presume these are the 'biasing voltage keepers' those must be kept 'charged' with the audio signal.

I don't know if I am posting to the correspondent forum, but I am asking the following: I have read once that there is a significant difference between SB (Self-biasing) and non-self biasing transformers regarding the sound quality.   I am asking if this information true and if yes, can...

I don't know if I am posting to the correspondent forum, but I am asking the following: I have read once that there is a significant difference between SB (Self-biasing) and non-self biasing transformers regarding the sound quality.   I am asking if this information true and if yes, can...

I read once from a listing at eBay, that the self-biasing transformers are 'out-of-phase' less dynamic, and other poor qualities compared to those are runs from the mains. I will copy and paste my question there, thank you for your help.

Dear Forum,   I don't know if I am posting to the correspondent forum, but I am asking the following: I have read once that there is a significant difference between SB (Self-biasing) and non-self biasing transformers regarding the sound quality.   I am asking if this information true and...

Dear Forum, I am now looking to buy a vintage set of Stax SR3 or SR5 Gold earspeakers. I would like to take the older model, the SR3 but I am afraid of that the membrane of the model is more likely perforated by overdriving or is inferior compared to it's newer model. Can you help me to...

After having these for a year, I've my first issue with one speaker. After a hot rainy day, I've decided to plug them off (to avoid any fault caused by an unwanted lightning struck) Next day (this morning) I plugged them in... A looping 'pop' from the left speaker ... 2 pops a sec to be...

Dear Forum, I have been owning an old SRM-Xp energiser for 3 years now. I assume that it's from the 90's so the electrolyt caps are probably dried out. I am asking you that if it's possible to change these caps at the PCB? Is it necessary or beneficial at all to exhange them to new...