Tubes Asylum

When I Bought the VTA ST-70, Bob Latino himself...

97.82.92.115

artemus

In Reply to: RE: I was speaking about posted by Tre' on August 12, 2021 at 10:05:57

Recomended the KT-66. That was 12 or so yrs ago. I can only tell you of my experience with the VTA ST-70 and Bob's recommendations. Others May prefer the El34. It becomes a matter of tastes.
=========================
You paid HOW MUCH for that electrical receptacle?!!! Are YOU nuts?

Follow Ups:

KT66 - Triode_Kingdom 11:50:36 08/12/21 (4)
It's not a matter of taste in terms of maximizing the tube's performance. Like the 6L6 family, the KT66 performs optimally with an a-a load around 6.6K or 7K. It really makes no sense to use anything other than the EL34 in the ST-70.

--------------------------
Buy Chinese. Bury freedom.
- I don't judge audio components by their measurements alone... - artemus 14:39:11 08/12/21 (1)
  I did that in the 80's and it was the worst purchaser I have ever made. Lesson learned. Good #'s do not necessarily add upo to good sound.
  =========================
  You paid HOW MUCH for that electrical receptacle?!!! Are YOU nuts?
  - RE: I don't judge audio components by their measurements alone... - Triode_Kingdom 14:47:34 08/12/21 (0)
    "Good #'s do not necessarily add upo to good sound."
    
    That's true, but changing the operating conditions so a particular tube produces worse performance is not a recipe for success.
    
    --------------------------
    Buy Chinese. Bury freedom.
- Yup - Tre' 14:10:28 08/12/21 (1)
  at 4300 ohms the power is down and the distortions are up. But some people like distortion so a person can say "it's a matter of taste". I wouldn't be one of those people. :-)
  
  Tre'
  Have Fun and Enjoy the Music
  "Still Working the Problem"
  - RE: Yup - Triode_Kingdom 14:39:11 08/12/21 (0)
    I've been wrangling with this problem myself due to the older HK amps I'm rebuilding. The transformers are 3.6K to 3.8K, non-UL, and they weren't meant for the EL34. The original tube was a beam power type, no longer available, and the EL34 is now the only tube that matches. Unfortunately, because it's a true pentode, the screen requirements of the EL34 in pentode mode are very challenging. You can't just use a dropping resistor and a bypass cap as is usually done with 6L6 types. I have at least four amps like this to "re-create", and it's giving me headaches and serious heartburn. :(
    
    --------------------------
    Buy Chinese. Bury freedom.

Post a Followup:

FAQ

Post a Message!

Forgot Password?

Moniker (Username):
Password (Optional):
	Remember my Moniker & Password (What's this?) Eat Me
E-Mail (Optional):
Subject:

Message:	(Posts are subject to Content Rules)

Optional Link URL:
Optional Link Title:
Optional Image URL:
Upload Image:
E-mail Replies:	Automagically notify you when someone responds.

To view your new posting or follow-up, click on the RELOAD or REFRESH button on your browser.

This post is made possible by the generous support of people like you and our sponsors:

Sonic Craft