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Who here tried the Sennheiser Orpheus? - Page 14

post #196 of 229
Quote:
Originally Posted by TheMiddleSky View Post
 

Yes, you're pretty right.

 

Wow what a guess, he has a pretty big and impressive collection from which I've been told. His R10 is the first and last time I will one when it was in a showcase at the Melbourne Jaben's store. Shame I didn't get to hear his K1000's. :(

post #197 of 229

Last day listening time...

 

 

post #198 of 229
I'm looking for service manuals for HE90 and HEV90. I'm particularly interested in learning how to remove the tube cages. Any help much appreciated.

BMF
post #199 of 229
Quote:
Originally Posted by bluemonkeyflyer View Post

I'm looking for service manuals for HE90 and HEV90. I'm particularly interested in learning how to remove the tube cages. Any help much appreciated.

BMF

It is about removing one of the screw on the bottom plate. I removed it on mine to replace tubes.
post #200 of 229
Quote:
Originally Posted by TheMiddleSky View Post

Last day listening time...






Are u using the DAC inside the HEV90 as a source? The DAC inside the HEV90 is not that good and pretty dated.
post #201 of 229
Quote:
Originally Posted by purk View Post

It is about removing one of the screw on the bottom plate. I removed it on mine to replace tubes.

Which screw?

What tubes did you try and which ones did you settle on?

Thanks!
post #202 of 229

Hi,

 

I'd be interested to find out how to remove the tube-cages on the HEV90 too - so that I can roll the tubes.

 

Thanks,

--Jatinder

post #203 of 229

Give me until the weekend and I'll let u guys know.  I actually never did put the screw back so hopefully, I'll be able to locate the missing screw without much hassle.  BTW, you will have to re-bias each tube if you ever want to roll tubes.  I actually forgot how to bias the tube already.

post #204 of 229
Quote:
Originally Posted by purk View Post
 

Give me until the weekend and I'll let u guys know.  I actually never did put the screw back so hopefully, I'll be able to locate the missing screw without much hassle.  BTW, you will have to re-bias each tube if you ever want to roll tubes.  I actually forgot how to bias the tube already.

Thanks for the help!

 

If anyone knows the procedure for biasing the tubes, please post.

 

Does anyone have a PDF of the service manual? ... not the informational brochure found on Sennheiser's support page.

post #205 of 229
Quote:
Originally Posted by purk View Post


Are u using the DAC inside the HEV90 as a source? The DAC inside the HEV90 is not that good and pretty dated.

Yep you're right, the dac part is really outdated for now. I was using AK240 as source at that moment.

post #206 of 229

Hope everyone is having a good forth of July.  Below are pictures illustrating how to remove the tube cage.  You will need to loosen two screws at the bottom plate of the amp.

 

 

 


Edited by purk - 7/4/14 at 9:43am
post #207 of 229
Quote:
Originally Posted by purk View Post
 

Hope everyone is having a good forth of July.  Below are pictures illustrating how to remove the tube cage.  You will need to loosen two screws at the bottom plate of the amp.

 

 

 

 

Purk,  

 

You're the Best!  Thanks so much for the help. I want to test the stock tubes with a calibrated - vintage tube tester.

Are you running the original tubes or did you switch them out? 

 

I'm interested in hearing from anyone who has rolled some tubes and would love some suggestions. I've got many NOS 9-pin tubes, none of the larger ones.

 

Happy 4th to all!

post #208 of 229

For Grins:

 

HE90 driver is fully open = ~ 70 x 110 mm

 

Hexagonal grille openings are ~ 2.5 mm (inside diameter)

 

Driver diaphragm grids are mini hexagons ~ 0.83 mm ... 7 per grille hexagon, viewed from the grille under magnification.

 

Each mini driver diaphragm grid contains 7 "sub-mini" hexagons ~ 0.25 mm.

 

Each "point" is a tiny wire loop ~ 0.021 mm that forms a "window screen" layout.

 

 

HE90 with many 2.5 mm grille hexagons

 

One, 2.5 mm grille hexagon magnified 10X

 

 

 

One, 2.5 mm grille hexagon magnified 60X shows the

diaphragm layout containing seven, ~ 0.83 mm mini-

hexagons. Each mini hexagon contains seven, ~ 0.25

mm sub-mini hexagons.

 

 

Same as photo above but under ultra-violet light. 

Each "point" is a wire "loop" measuring ~ 0.02 mm.


Edited by bluemonkeyflyer - 7/5/14 at 5:09am
post #209 of 229
Quote:
Originally Posted by bluemonkeyflyer View Post
 

For Grins:

 

HE90 driver is fully open = ~ 70 x 110 mm

 

Hexagonal grille openings are ~ 2.5 mm

 

Driver diaphragm grids are hexagonal ~ 0.5 mm ... 7 per each grille hexagon, viewed from the grille under magnification

 

Each "point" is a tiny wire loop that forms a sort of window screen layout

 

Many grille hexagons

 

One Grille hexagon under magnification shows the diaphragm with seven mini-hexagons for each grille hexagon

 

Under ultra-violet

Thanks for those wonderful pics.  What are you trying to do with your HE90?  Why did you take them apart?

post #210 of 229
Quote:
Originally Posted by purk View Post

Thanks for those wonderful pics.  What are you trying to do with your HE90?  Why did you take them apart?

Oh, I would not dream of taking them apart! I just want to test the tubes.

The photos were taken with an inexpensive telephoto lens attachment for iPhone.
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