Millet Hybrid Construction Thread

[James281]

could someone post some pictures of their compete project with all the wire in from top view?

this is my first diy project and i don't want to make any mistake

here is what i got, this take me like 30 minutes and seem pretty darn easy so far.

 

[klappar]

Quote:

Originally Posted by klappar I finished my board but I dont get any sound... even no noise/hiss. I can adjust the bias fine. Only wierd thing is that the tubes get quite hot in only few minutes. Tried both the 12FK6 and 12AE6. Bias was 12V for both. Checked my wiring and soldering and detected no shorts or bridges. My power supply is unregulated 24V/1A, with heaters on it gives 27.5V. Any suggestions how to debug this situation? Thanks!

Okay... found out that my output jack is of breaking type and my L + G are on breaking side ;P Will resolder it later today and see what happens.

 

[klappar]

Quote:

Originally Posted by klappar Okay... found out that my output jack is of breaking type and my L + G are on breaking side ;P Will resolder it later today and see what happens.

Okay, rewired the output jack but still no sound gets outputted... and the tubes get quite hot.

 

[NOTHINGness]

It looks like you need to jumper from L_POT_1 to L_POT_2 and from R_POT_1 to R_POT_2.

 

[Jaypetermen]

klappar,

Is the output jack of the switching variety?

If so, you may want to check to make sure that it's wire correctly.

 

[drewd]

Quote:

Originally Posted by klappar I finished my board but I dont get any sound... even no noise/hiss. I can adjust the bias fine. Only wierd thing is that the tubes get quite hot in only few minutes. Tried both the 12FK6 and 12AE6. Bias was 12V for both. Checked my wiring and soldering and detected no shorts or bridges. My power supply is unregulated 24V/1A, with heaters on it gives 27.5V. Any suggestions how to debug this situation? Thanks!

If you are going to use the "outboard" pot connections, then you must install the jumpers on the other side of the board to connect the input signals to the pot. There are pads for two jumpers, one for each channel.

The tubes should get very hot - not so hot that you can't touch them, but hot enough that you don't want to hold onto them for very long.

-Drew

 

[klappar]

Jumpered r_pot and l_pot pads and now I have sound

Thanks for everyone for suggestions. Btw, wouldn't it be nice to put this information about outboard pots somewhere visible?

 

[drewd]

Quote:

Originally Posted by klappar Jumpered r_pot and l_pot pads and now I have sound Thanks for everyone for suggestions. Btw, wouldn't it be nice to put this information about outboard pots somewhere visible?

Yes, my bad - I will make that update today.

-Drew

 

[ntsour]

Sorry for asking this again. I have searched on the forums but I am unable to source the exact models as were suggested in others posts.
For the moment my candidates are:

Mascot 2183000043 from rscomponents which is rather expensive €47: Mascot 2183

A cheap one suggested by lini that I don't know for sure that it will give enough juice for the hybrid:
http://www.pollin.de/shop/shop.php?c...=ODk1OTc5&ts=0

Any suggestions?

 

[MASantos]

Quote:

Originally Posted by ntsour Sorry for asking this again. I have searched on the forums but I am unable to source the exact models as were suggested in others posts. For the moment my candidates are: Mascot 2183000043 from rscomponents which is rather expensive €47: Mascot 2183 A cheap one suggested by lini that I don't know for sure that it will give enough juice for the hybrid: http://www.pollin.de/shop/shop.php?c...=ODk1OTc5&ts=0 Any suggestions?

Hello, what is your budget?
With the exchange rate from €-$ you could build yourself a steps for around 60€ I think.

There is also the veleman V-K1823 for 10£ from maplin.

http://www.maplin.co.uk/Module.aspx?...U=3488&T=17602.

Manuel

ps: greetings from Lisbon, Portugal

 

[ntsour]

Quote:

Originally Posted by MASantos Hello, what is your budget? With the exchange rate from €-$ you could build yourself a steps for around 60€ I think. There is also the veleman V-K1823 for 10£ from maplin. http://www.maplin.co.uk/Module.aspx?...U=3488&T=17602. Manuel ps: greetings from Lisbon, Portugal

Thanks for the suggestion. I would prefer not to use DIY kits for the PSU as I am not very experienced and have a tendency to make careless mistakes with my DIY projects. Playing with 230V on an uprotected circuit is not a good idea for tme.

I am basically looking for a good enough comercial PSU. I was hoping to pay around 20€ for something reasonable but if there is no other choice I'll go for the more expensive mascot.

 

[Secret Squirrel]

Is there any issue using a 100 k alps pot with the millet hybrid?

 

[drewd]

Quote:

Originally Posted by ntsour I am basically looking for a good enough comercial PSU. I was hoping to pay around 20€ for something reasonable but if there is no other choice I'll go for the more expensive mascot.

The AC adapter from Pollin will probably do the job, but it's not the best choice. Ideally, you should use a linear, regulated power supply, but, since those are expensive, the next best thing would be to find a regulated switching power supply.

I looked at the selection from RC and Pollin and there are a few that fit the criteria. I don't envy you having to pay those prices, though! Yikes!

Having said that, though, I've used a Millett Hybrid with a very cheap non-regulated, switching power supply and the amplifier did sound quite nice. You can hear the difference with a linear supply, but if that's out of your budget, get what you can afford and just save up for an upgrade later!

-Drew

 

[drewd]

Quote:

Originally Posted by Secret Squirrel Is there any issue using a 100 k alps pot with the millet hybrid?

No, I've used pots ranging from 10K to 100K with no problem.

-Drew

 

[ntsour]

Since I have to order the Alps Pot from RS-Components (€22 mind you) I'd rather order a Mascot and avoid shipping costs from another source.

I finally found the 2083 model that people suggest on this board. It was there but not very intuitively placed.

Anyway, final question. Two options:
Mascot 2183: linear, regulated, 24V, 1A, 24W, 41€
Mascot 2083: linear, regulated, 24V, 500mA, 14,4W, 29€

Is 500mA safe enough in order to save me 11€. Absolute minimum is supposed to be 400mA but I don't now, is 100mA too smal a buffer? Or go for the 2183 that has more margin?

Thanks all for your help.