[sachu]

Quote:

Originally Posted by holland /img/forum/go_quote.gif Heh. For someone not looking for a back and forth you sure are coming off strongly. I understand you're passionate about the CTH so strong opinions are somewhat expected. As far as opinions go, I never disputed yours, other than the "extreme roll-off". You may want to re-read my original posting. For the poster of the question, you may want to start another thread.

Holland,

Stating a preference is not being passionate. OTOH, the only amp that I possibly will ever be passionate about is the EHHA.

 

[holland]

Quote:

Originally Posted by sachu /img/forum/go_quote.gif Stating a preference is not being passionate.

Sure, but 3 times seems to be.

OK, enough with that.

Quote:

Originally Posted by sachu /img/forum/go_quote.gif OTOH, the only amp that I possibly will ever be passionate about is the EHHA.

I haven't heard one yet, but plan to build one soon. I don't think any of my locals have one. I hear it's good from dBel84, who has been speaking of it for quite some time. It probably needs a comparison against the Borbely (sp?) hybrid.

 

[sachu]

Quote:

Originally Posted by holland /img/forum/go_quote.gif I haven't heard one yet, but plan to build one soon. I don't think any of my locals have one. I hear it's good from dBel84, who has been speaking of it for quite some time. It probably needs a comparison against the Borbely (sp?) hybrid.

I have his EHHA on my desk right now..

Compared it against the Stacker..The stacker is a very nice amp for sure, but the EHHA does some things better than the stacker and vice versa.
These two amps are something else.

My EHHA amp chassis is all ready and the EHHA order is on its way

 

[holland]

Quote:

Originally Posted by sachu /img/forum/go_quote.gif I have his EHHA on my desk right now.. Compared it against the Stacker..The stacker is a very nice amp for sure, but the EHHA does some things better than the stacker and vice versa. These two amps are something else. My EHHA amp chassis is all ready and the EHHA order is on its way

No fair....

*sigh* Stacker 2....is it much further, papa smurf?

 

[tacitapproval]

Ok, testing out CTH for first time. E12 trips correctly and goes red to green. TB+ at 100v, but pins 1 and 6 are at @95v each. Help needed............

 

[runeight]

There are several easy things to check before we need to do deeper debugging.

1. Are D1L and D1R in the correct orientation with their anodes to the B+
2. Are the opamps ICL and ICR correctly oriented in the sockets?
3. Check all resistor values in the input stage and make sure the resistors are in the right places.

If all of this is ok then we'll need to take some other measurements.

 

[runeight]

One more thing. Is the tube lit?

 

[runeight]

And I guess two more questions. What tube are you using and what do you have the heater voltage set at?

 

[tacitapproval]

Diodes are correct, as are the opamps.
I double checked the input resistors and they are accurate.
Tubes light. I have tried both a 12au7a and a 6p1n, switiching the heater accordingly.
With the tubes inserted the e12 goes green for a second and then cut off to red. With no tube it stays green.

 

[runeight]

Could you please measure all of the tube pins with respect to SG. And also the 24V supply to be sure that we have 24V.

Are you using all stock BoM parts?

 

[tacitapproval]

I just realized that my OG is sitting at 14v not 12. The transformer is putting out 28v not its rated 24.

 

[runeight]

Ah, this is a start. Is the LV rail 24V?

 

[tacitapproval]

I'm sorry, how do I measure the LV rail?

 

[runeight]

Easiest way is to measure both outside pins of the 24V regulator. One pin should be around 30V or more and the other at 24V. If the amp is inside the case be careful not to short anything out to the case.

 

[tacitapproval]

29.1 on one side and 28.5 on the other.