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Analog Squared Paper Discussion and Appreciation Thread. - Page 102

post #1516 of 3484
Quote:
Originally Posted by CJG888 View Post

Have just taken delivery of one of the last pairs of DT48s (25 Ohms). I have only had a chance to test them with an older Marantz integrated, and they're not run in yet, but first impressions are extremely promising. The frequency extremes are curtailed and the soundstage is compact, but the degree of clarity and the quality of the midrange are absolutely astounding (reminiscent of electrostatics). I will try them with an OTL valve amplifier when I get back to China...


interesting good news as i always was thinking of buying a dt48. btw, up to now i thought otl amps are not that good in driving low impedance headphones, so would be very interested which one you want to use!

post #1517 of 3484
Well bad news for me. I opened up the case and did the battery bias check, all well there. But then I plugged in my headphones to check all was well and then unplugged them and the amp stayed on. I tried the remedy Shikada san told me about but the switch is just too weak. I sit here with my amp on and can do nothing about it!

I have written to Shikada san to send the amp back to be fixed but I have also asked him to cover the cost of shipping it back as shipping in Canada is very expensive and this is a design fault. I am hoping he does the right thing with this and will let you all know.

As you know, I am a big supporter of this firm but as with all of them the true test is when something goes wrong.

So, I am ampless now for a few weeks, at least I can still listen to my player and DT1350's in the meantime!
post #1518 of 3484
Quote:
Originally Posted by ianmedium View Post

Well bad news for me. I opened up the case and did the battery bias check, all well there. But then I plugged in my headphones to check all was well and then unplugged them and the amp stayed on. I tried the remedy Shikada san told me about but the switch is just too weak. I sit here with my amp on and can do nothing about it!

I have written to Shikada san to send the amp back to be fixed but I have also asked him to cover the cost of shipping it back as shipping in Canada is very expensive and this is a design fault. I am hoping he does the right thing with this and will let you all know.

As you know, I am a big supporter of this firm but as with all of them the true test is when something goes wrong.

So, I am ampless now for a few weeks, at least I can still listen to my player and DT1350's in the meantime!


could you post sone pictures of the jack and the the cableling of the amp around the jack for a online analysis, also try to take a photo looking into the jack with a light ?!

post #1519 of 3484
Will do GG, I am just letting it run with music at the moment to drain the battery so that I can take the tubes out and get it ready for shipping back.

Here is an old photo of it though when the problem first happened, the jack now though is very loose on what I would call the tongue which you will see what I mean in the picture!

AppleMark
post #1520 of 3484
Quote:
Originally Posted by ianmedium View Post

Will do GG, I am just letting it run with music at the moment to drain the battery so that I can take the tubes out and get it ready for shipping back.

Here is an old photo of it though when the problem first happened, the jack now though is very loose on what I would call the tongue which you will see what I mean in the picture!

AppleMark


can you take a picture camera higher more on the right side to see the jack more looking left down to see the metal parts and cables soldered to?


Edited by GermanGuy - 8/6/13 at 1:45pm
post #1521 of 3484
To be honest it is really tight in there and this is the best I can do
post #1522 of 3484

okay, normally the tongue works like a metal spring. if the connector is plugged in, the tongue is pressed against another metal part, so switching the amp on. you can switch the amp off by just using a tooth picker moving the tongue in its normal position. have to draw a picture, will continue ...

 

beg your pardon for the drawing, just out of tablet...

 

the switch normally is made out of two parts. image one in open position, no connector plugged in. the inner part / tongue is surrounded by the outer part.

 

if you plug in a connector, the inner part is pressed against the outer part, image 2. it is like a metal spring, if you unplug the connector, it should move back to position 1.

 

drawing 3 - sometimes it happens that the outer part is accidently bent or whyever the inner part is moved above the outer part or pressed against, then switch is always on, the force of the inner parts spring function always pressing against the outer part. in this case use a wooden or plastic tool to move the inner and outer part to it's standard positions (image 1).


Edited by GermanGuy - 8/6/13 at 2:24pm
post #1523 of 3484
Tried this GG but the actual switch is so worn there is no spring in the tongue any more.
post #1524 of 3484

Ian, I am sorry to hear of your troubles. Going without the amp for an indeterminate period of time is without question an undesirable circumstance. Especially when the sound it produces is so addictive.

 

On one hand, I am not surprised that an on-off switch built into the 3.5 mm jack is unreliable (I toasted an Audio Alchemy unit back in the day due to similar circumstances), on the other hand, with regular usage, I have had zero issues with any of my other devices that use 3.5mm jacks (including my Tu-05). With the caveat being that all of these other devices did not incorporate a power switch, etc.

post #1525 of 3484
WC, I think the problem really is using the socket as a combined HP and on/off switch though it seems GG is having problems with his socket.

Hopefully I will hear back soon. In the mean time the amp is glowing, one channel only working so I can't even listen to music, I guess the one channel is the socket.
post #1526 of 3484

Ian, sorry to hear about what happened to your amp.

Hope Shikada san may fix it as soon as possible so that you will get back your unit in no time.

 

On the bright side, may be it's time to have some more "customization"?  wink_face.gif

post #1527 of 3484
Well an update.
Shikada san just sent me a lovely message apologizing for the problem. He is covering shipping and will put the new power switch separate headphone socket on my amp.

So I will mail it off to him tomorrow, shipping from here to Japan takes 6-10 days by air so hopefully by the end of this month, begging of next I will have my amp back. I am truly going to miss this amp but at least it is summer so I have diversions to take my mind off it not being here.

The sign of a really great manufacturer is not only the quality of the product they sell but more importantly the back up offered when things go wrong. Shikada san excels on both fronts and anyone thinking of this amp or owns it just know your looked after.
post #1528 of 3484
Quote:
Originally Posted by ianmedium View Post

Well an update.
Shikada san just sent me a lovely message apologizing for the problem. He is covering shipping and will put the new power switch separate headphone socket on my amp.

So I will mail it off to him tomorrow, shipping from here to Japan takes 6-10 days by air so hopefully by the end of this month, begging of next I will have my amp back. I am truly going to miss this amp but at least it is summer so I have diversions to take my mind off it not being here.

The sign of a really great manufacturer is not only the quality of the product they sell but more importantly the back up offered when things go wrong. Shikada san excels on both fronts and anyone thinking of this amp or owns it just know your looked after.

 

 

Fantastic news Ian. Thank you for updating us.

post #1529 of 3484
Just saw a post on Facebook, the lucky owners of TU-06 #001 & #003 will be getting them soon!
Nice to see despite the much lower cost Shikada san still packages them in the gorgeous wooden boxes!

*
post #1530 of 3484
Quote:
Originally Posted by ianmedium View Post

Just saw a post on Facebook, the lucky owners of TU-06 #001 & #003 will be getting them soon!
Nice to see despite the much lower cost Shikada san still packages them in the gorgeous wooden boxes!
 

 

I think one of them is for Anakchan. Did he get it in time before he leave for Oz?

 

Two down, six more to go before he start building mine. My is #009. biggrin.gif

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