Dual La2a - [silent:arts] version

[bernbrue]

Hi,
could look like this:




regards
Bernd

[[silent:arts]]

Looks good, but the Power Switch in the middle ???
and remember: to fit it in a 2U case, modifie the sockets of V104 / 204 (while you are there do V102 / 202 too).

[waldorfcave]

I started to stuff the nice pcbs.

Can i use 1/4 Watt resistors or should they be 1/2Watt as written in the
drip manual

r229,r129 and r134, r234 are 3 watt as written in the parts list.

[[silent:arts]]

I used 1/4 Watt wtih no problems.
and I used 2W (with spacers) instead of 3W - they get a little hot, but it works.

[bernbrue]

to fit it in a 2U case, modifie the sockets of V104 / 204 (while you are there do V102 / 202 too).

Hi Volker,
for the tube sockets, what exactly do I have to do with them? Removing upper or lower part to reduce their height?
I've got these sockets:


regards
Bernd

[[silent:arts]]

just remove the upper part (dremel works well):

[bernbrue]

Ah, I see, I thought I had to remove the upper part of the ceramic socket, so the upper parts of the pins have to be removed. Thx Volker.
regards
Bernd

[[silent:arts]]

yes, only the upper part parts of the pins
gave me the 3 mm I needed (when using 5mm spacers - and is case dependent)

[ChuckD]

Why did you go with the Solen 10uF caps instead of the TC72 Mallory?
Did you get a chance to compare the two?

Starting my BOM. HEy if anyone is interested I have finished sourcing the parts# for the Caps in North America. (Mouser and PartsConnexion)

Still can't believe we can get by with 1/4W resistors!


I'll post it up if there are any Folks beside me building one over here.

-ChuckD

[[silent:arts]]

Why did you go with the Solen 10uF caps instead of the TC72 Mallory?
Did you get a chance to compare the two?

no, haven't compared them. the easy answer is: I just used components I had arround, or where I knew I can buy them
I have no idea if there is any source for the Mallory in europe.

oh, and the 1/4W resistors work fine in my unit
(but remember the four 2W resistors)

[ChuckD]

Volker,

I have 4 older Mallory Caps (silver cans) that someone gave to me for free. Send me you address and I will mail you 2 of them! I will use the other two on mine. I measured them with my Fluke MM and 2 came out as ~13uF and the other 2 came out as ~12uF so I will pair them up that way.

Not sure if they are good. They are new old stock but they were free ... so.

I will throw them in the post for you.

-ChuckD

[[silent:arts]]

hey Chuck,

if you don't need them - many thanks

[bernbrue]

Volker,
there are two resistors (R125,225) to be determined. They seem to be related to the GR meter. Assuming, I´ll take a Sifam VU, what are there values? What did you take there? Thx a lot.
Cheers
Bernd

[[silent:arts]]

Bernd,
this is the resistor Urei provided with each T4b.
rumors are they are always 33K (mine were both 33k).

[ChuckD]

I was about to ask the same question!

I'll go with 33K I guess.

-Chuck