Dear Mr. Metaxas,

as you mention that the TLM50 has a transparent sphere inside, my assumption is that it is probably an early 1990s one. Is that possible? If so, as Erik mentioned: some early TLM50s did have a "rumbling" problem, due to some processes inside the capsule (the most expensive part, sorry...). Took some years to solve that problem.

Since 2000 (if I remember correctly), all TLM50s come with the same titanium capsule as the M150s. No rumbling problems since then :-)

Thinking about buying TLM50 / M150 you should contact Syntec Australia (+mail copy to me at schneidm-at-neumann.com,) . They might not have them in stock for testing, but we should see what can be arranged.

Best regards,
Martin Schneider / Neumann Mic. Development