NAD ashdown ctm300

[stewblack]

On 25/04/2020 at 13:12, Merton said:

I always turn off the preheat first, I read something somewhere once that it made more sense that way round but buggered if I can find it now!

I do too. And am similarly buggered. 

[la bam]

Did a bit of experimenting - turning off the main ht first keeps the fans on, which may help with cooling until you turn the preheat off as well?

Although will that mean its pre heating and cooling at the same time? Confused!

[stewblack]

On 26/04/2020 at 13:44, la bam said:

Although will that mean its pre heating and cooling at the same time? Confused!

@Ashdown Engineering HELP!!!!!!

[Ashdown Engineering]

19 hours ago, stewblack said:

@Ashdown Engineering HELP!!!!!!

Best bet would be give Dave Green a call who designed the amp and have a chat... 01621 857853. He's in currently and would be happy to clarify best way to use 

[Merton]

Dave Green is a dude, he's helped me on more occasions than it's really fair to ask

Edited April 28, 2020 by Merton

[la bam]

Just spoke to Dave Green. Very helpful.

Got everything I needed answering.

@walshy I know you are due a ctm300 too, so this may be of use.

1. Biasing is fine as long as everything is under 0 and out of the red. The valves will take a while to settle in (100 hours) so as long as everything is under 0 you'll be fine.

2. To bias - make sure theres no signal in the chain. And as always make sure you have a speaker connected.

3. Turning on - pre heat ON, leave for a minute or two, the Main ON.

4. Turning off - this was interesting:

Turn MAIN OFF then keep playing a note until you dont hear anything - this takes the charge away, so theres no charge stored for weeks etc - then pre heat OFF.

Oh, and only use the valves designed for the amp.

Hope this helps.

Edited April 28, 2020 by la bam

[Lozz196]

2 hours ago, Merton said:

Dave Green is a dude, he's helped me on more occasions than it's really fair to ask

Same here, quality  bloke (and it’s law to never turn up to see him without biscuits)

[Reggaebass]

Dave green is a legend, I’ve met him many times, top man 

Edited June 16, 2023 by Reggaebass

[walshy]

4 hours ago, la bam said:

Just spoke to Dave Green. Very helpful.

Got everything I needed answering.

@walshy I know you are due a ctm300 too, so this may be of use.

1. Biasing is fine as long as everything is under 0 and out of the red. The valves will take a while to settle in (100 hours) so as long as everything is under 0 you'll be fine.

2. To bias - make sure theres no signal in the chain. And as always make sure you have a speaker connected.

3. Turning on - pre heat ON, leave for a minute or two, the Main ON.

4. Turning off - this was interesting:

Turn MAIN OFF then keep playing a note until you dont hear anything - this takes the charge away, so theres no charge stored for weeks etc - then pre heat OFF.

Oh, and only use the valves designed for the amp.

Hope this helps.

Thanks dude, very handy. Mine should arrive end of this week 🤞

[BruceBass3901]

18 minutes ago, walshy said:

Thanks dude, very handy. Mine should arrive end of this week 🤞

We'll keep an eye out in the Northeast for a seismic event 😉

[BruceBass3901]

4 hours ago, la bam said:

Turn MAIN OFF then keep playing a note until you dont hear anything - this takes the charge away, so theres no charge stored for weeks etc - then pre heat OFF.

I love finding out that I have been turning my amp off 'wrong' for 6 and a half years  😅