[johnwmclean]

Boys settle down, here’s some sinks...

 

[sachu]

^^ thats just COLD man..we need to change that soon

 

[johnwmclean]

... getting closer

One pay check at time. lol

 

[aloksatoor]

V nice John you would totally need those offboards

just on 5 second power up tests for my boards my heat sinks (stock) were too hot to touch

 

[aloksatoor]

Hey I think I found the problem with the BOM. The one Jeff sent me has r5 and r7 as 47.5 K ohms and the one on Cavalli audio is 47.5 ohms

... Should have verified... Thanks for the help I hope this would solve my issues. Liwei also had the same voltages so I had PMed him too that got me rechecking against Cavalli audio.

Quote:

Originally Posted by sachu /img/forum/go_quote.gif ^^ am thinking you mean pin1 and pin6. Those voltages seem to be around the right ballpark..you need to have about 2.5V less than rail on the plates of the tubes..so its alright. The voltage across the resistors is definitely off by 0.3-0.4Volts. WE'll worry about this later. Try going through the rest of the setup and see what you come up with.

 

[sachu]

aah yes..I sent him an email about that a few months back and he said he'll rectify it.

 

[Horio]

Quote:

Originally Posted by johnwmclean /img/forum/go_quote.gif Boys settle down, here’s some sinks...

I was waiting for you to chime in John...

 

[runeight]

Quote:

Originally Posted by aloksatoor /img/forum/go_quote.gif Hey I think I found the problem with the BOM. The one Jeff sent me has r5 and r7 as 47.5 K ohms and the one on Cavalli audio is 47.5 ohms ... Should have verified... Thanks for the help I hope this would solve my issues. Liwei also had the same voltages so I had PMed him too that got me rechecking against Cavalli audio.

This will definitely mess up the amp. In fact, it will hardly work at all with 47k5 resistors. Your amps, if they make noise, must sound like crap.

Maybe everyone should check this.

 

[johnwmclean]

mmm... my BOM states 47.5 K ohm, but I’ve been supplied 47 ohm. Would .5 ohm be anything to quibble about?

 

[sachu]

^^no. So long as it is 47R and not 47k it will do fine.

 

[johnwmclean]

ok cool

 

[wink]

John,
47 ohm to 47.5 ohm is only about 1% difference.

Cool, as in heatsinks?

 

[johnwmclean]

Thanks Erwin!

Another query, I’m wanting to chassis mount the tubes, to do so I’ll need to run a short length of cable. Would there be any foreseeable problem doing this? Cable length would need to be around 80mm.

 

[runeight]

Probably not a problem. Just remember that every wire extension adds inductance, capacitance, and resistance to the circuit.

 

[johnwmclean]

Joy! That solves the problem lining up the top plate holes.

Thanking you Alex.