judo

To the heat issue: I have a "standard" mini from the first group buys. Case, the unfortunate 3 oz board, 402 led resistor, 255 bias resistor, 15 mA bias. I used it with offboard regulators and without the top cover mainly for a time. Now I squeezed in the onboard regs second times a bit better with the same heatsinks but only with open lid. I would not like to reduce the bias so I experimented with @Skooby's resolution(see in this thread) a little. In my version there is almost 10 mm the distance from the transistors's heatsinks to the lid so I made a "heat bridge" from two 5 mm thick aluminium pieces as you see in the picture. The result is more than I hoped. Measuring the temp on the heatsink hotter side: with the top cover 85-86C; without the cover 70C. With the "heat bridge" and the cover 63C. The absolute temperature is depends on the ambient, the music, the headphones a bit but the more than 20C gain is stable. This was a surprise to me, the mod is easy maybe helps somebody. You can secure it with screws, widen it etc.. Maybe later. It is stabil mechanically I am happy with it as is. Thanks for Skooby! The temperatures were measured after cc. 90-120 minutes when they were stable.

I did not see Amb's board but some of the available little tps boards have enable pin. The fix can use them(or the mini GRLVs ? ) too paralell with the onboard regs maybe . You can replace the Amb's and use them for other purpose. Brainstorming for the cost of somebody else I know.

Payment sent. Thanks!

Dear Michael, increase my GRLV78 XX, GRLV79xx numbers to 3 each from 2, please! Thanks!!, no more changes.

Kerry, the GRLV78/79xx can be usable in your dynalo mini ?

I would like bare PCBs too. May I double the ordered numbers except the T2 boards? Thanks!

Preassembly less fun. I have bought a Quick 861DW hot air station and I would like to play with it.😀

Thanks! For the answer and for the much work. You know the the TPS7As were a real challenge with the mini dynalo, Kerry's (and Kevin Gilmore) design. So I thought there were some experiences.

That HN4A51J compared with the TPS7A... regulators seems easy. Maybe I am not right I did not do much similar. Is this the hardest solderable part ? The size is the main problem or stg else?

If it was not too late: 2x GRHVxxx1x GRLV79xx1x GRLV78xx1x Main Board 1x miniT2

Not so absurd. I have two old sr-003s and nowadays I am using them for movies with a carbon. They are not perfect I am thinking about refurbish them. Cleaning, rebias, repair the contacts etc. Any experience ?

Change the bias in any Stax ore Gilmore is easy what has to be done yet? Limit the voltage swing? Ooh, sorry... A joke

You are right but are there good enough closed headphones at all? I have never heard the 4070 but they say it is not the best stax. Maybe depends on the music you usually listen too.

I can endure the bleeding if it has the quality. So an sr-007 with the portable or it is not possible an sr-003 with highs.

I think we are glad because you inform us. We beleive you with cause. What about a quality portable amp or is it not possible at all?

Arrived too. I will never understand the US Post the package was here at Budapest on 25th by the tracking where was after? There was my other packet went back and forth on the Los Angeles San Francisco line for almost a month instead of coming to Hungary. Was not possible to change its way. Not the Hungarian Post Office was so perfect.

My sr-007 not farts I have not done the port mod I was curious but did not feel it necessary. The original pads are soft and seal fairly well so I think they are ok with glasses, not much difference. The newer spare pads are harder so no glasses. ? The old Lambda Signatures were noisy and the little sr-003s.

No fart with glasses( I have too) they are not sealed. Any differences in the sound you hear ?

Payment sent. Thanks!

Paid. Thanks!

The lasts from PJ were SZ2, mine is for example.I bought from there because I wanted the new diaphragm too. I do not know this is true or not, PEEK or mylar, etc... Spritzer always tells there is no real system in the serials.

Why, the newest what I heard about were sz2 or there is a new version or new serial system?

About clean room. My sr007 had developed an imbalance and when I inspected the drivers I found grey hair under the dustcovers. Not only one piece, was it human hair or from the brush of the Stax technician I do not know. The headphones came from PJ but Stax repaired them after some effort they had replaced both driver. I am not sure either the hair was the cause of the imbalance. I have the picture of a piece of hair somewhere.