What should I expect switching from 5U4G to 5Z3 in general? Is there a specific 5Z3 family sound compared to 5U4G?

My 300B amp uses 5Z3P rectifier stock. I'm rolling 5U4G right now without issue. Should I assume the older 4 pin 5Z3 will also work too as long as I use the necessary 4 pin to octal socket adapter? Both 5U4G and 5Z3 have identical max operation numbers. Thanks.

Is there any reason to avoid weaker testing vintage rectifier tube on fleabay if you can have it for a song? Can a barely "good" testing 5U4G do any damage provided it has no short, let's say seller says minimum is 40 and the tube tested 47 / 48?

Are you using the HEV-70 amp? Probably one of the aging drivers need more time to fully charge up since you haven't used them for a long time. I wouldn't sweat about it if they sound good after warming up. It could also be dust. Try very very gently vacuuming them to see if it helps.

Same here speaker and vinyl setup for me these days. Is there any issue with K1000 sitting unused for too long? I leave mine in the wood box when I'm done with it.

Has the K1000 market cooled off? Low $1k-ish seems to be the norm these days for most K1000s.

I'm asking because I saw this old FS thread with what looks like OEM replacement pads. https://www.head-fi.org/classifieds/fs-akg-k1000-relic-from-the-past.25817/

Where can I buy replacement K1000 pads in US and what are their part numbers? Thanks.

I'm looking to pair HE-60 with an aftermarket amp and checking out this e-stat amp spreadsheet done by another HFer. What are the maximum "safe" RMS and peak voltage numbers I need to keep under so I won't be able to overdrive and damage my HE-60 by accident...

Has anyone compared the discontinued SRM-007T to the current models like SRM-500T? Which is the one to get? Thanks.

Which discontinued Stax amp doesn’t have this infamous blue ALPS volume pot for those who prefer keeping it stock? Thanks.

When did you get your Stax adapter from Moon? I searched the site but nothing for HE60 only HE90. :triportsad:

Bump. Any update on the availability of the elusive HE60 to Stax adapter for those who are DIY challenged?

Where can I buy Stax type adapter in the US for using HE-60 with Stax, etc. electrostatic headphone amp? Thanks.

Aging HE-60 transducers and HEV-70 caps needing replacement?

For future reference, who's the best tech in the US for any HE-60 / HEV-70 related repair? Thanks.

The earpads and headband of my HE-60 dry rotted. I got the replacement parts. How do I perform the "surgery" or just pull them off gently? Thought I ask before doing any damage. Thanks.

Or let me put it this way. How's ERA-1 compared to other real electrostatic headphones in general?

I read the ERA-1's sonic signature is modeled after the ESL-57 electrostatic speakers. Should I even bother with ERA-1 if I already own the Baby O?

Is ERA-1 made in China?

How much does it cost for the full service at Sennheiser?

Actually I'm in the US. Does Sennheiser US still service HE60/HEV70?

Unfortunately I don't have a Stax amp for testing. The pads on mine are dry rotting. I suspect some of the particles may get on to the panels and causing issues. How can I make sure the panels are clean?

I have a set of HE60 and HEV70 that haven't been used for a couple of years. Is it normal for the HE60 to give loud scratchy sound with pops and ticks? It was really bad the first time I fired them up again. Now the noise only happens during the first 5 minutes from a cold start. After that...

Anyone has experience with the sound quality of Samsung Galaxy Note 2?