Toure14

Re: [BUILD] GIX-51X tube preamp
« Reply #180 on: May 11, 2013, 04:11:02 PM »
what about the LS for some of the WIMA caps is that just for pricing options as well? what is the size that was originally spec'd? so it is safe to assume all CAPS are electrolytic if not stated as something else?


gemini86

Re: [BUILD] GIX-51X tube preamp
« Reply #181 on: May 11, 2013, 06:40:42 PM »
what about the LS for some of the WIMA caps is that just for pricing options as well? what is the size that was originally spec'd? so it is safe to assume all CAPS are electrolytic if not stated as something else?

The options listed are just options. Some are more available than others so I added pads for multiple LS options. I generally go by price there as well.

Anything that's not marked as a film cap is an electrolytic. The lead spacing for them should be 5mm, but anything close will work. Unless you use snap-ins, the leads will be plenty long enough to fit whatever lead spacing needed.
- Rodney

"...you better call Kenny Loggins, 'cause you're in the danger zone."

Toure14

Re: [BUILD] GIX-51X tube preamp
« Reply #182 on: May 12, 2013, 02:44:03 AM »
Almost done with the Mouser cart few more questions:

on these caps there is no specified voltage so is 35V okay to use?
  100u     3   "C26, C27, C29"
  470u     1   "C11"
  47u     1   "C28"

on this cap the specified LS isn't an option. Only 15mm. Can I use another 15mm instead which is the exact same as "C3"?
  470n     1   "C5"   5/7.5/10mm LS WIMA 250V

These part numbers aren't readily available (backordered). Are there any subs?
   ES3G     1   "D501"   (mouser)625-ES3G-E3
   330uH     1   "L501"   (mouser)652-SRR1210-331M


   

jandoste

Re: [BUILD] GIX-51X tube preamp
« Reply #183 on: May 12, 2013, 09:55:35 AM »
Hey Rodney,
I allready solder L503 but maybe i must change it no?
thanks

gemini86

Re: [BUILD] GIX-51X tube preamp
« Reply #184 on: May 12, 2013, 12:45:13 PM »
Almost done with the Mouser cart few more questions:

on these caps there is no specified voltage so is 35V okay to use?
  100u     3   "C26, C27, C29"
  470u     1   "C11"
  47u     1   "C28"

on this cap the specified LS isn't an option. Only 15mm. Can I use another 15mm instead which is the exact same as "C3"?
  470n     1   "C5"   5/7.5/10mm LS WIMA 250V

These part numbers aren't readily available (backordered). Are there any subs?
   ES3G     1   "D501"   (mouser)625-ES3G-E3
   330uH     1   "L501"   (mouser)652-SRR1210-331M

 100u     3   "C26, C27, C29" should all be 35V

  47u     1   "C28" should be 63V

  470u     1   "C11" is for V2's cathode, which is very low voltage so it can be as low as 6.3V.

This inductor for L501 may fit... it's slightly larger, (by .5mm) so you'll have to try your luck, or keep sifting through the mouser catalog for something closer. Or digikey has them in stock.

This diode for D501 will work perfectly. It's the same diode but with a 300V reverse breakdown instead of 400V, which is still a safe margin above the 250V output of the converter.
- Rodney

"...you better call Kenny Loggins, 'cause you're in the danger zone."

gemini86

Re: [BUILD] GIX-51X tube preamp
« Reply #185 on: May 12, 2013, 12:46:16 PM »
Hey Rodney,
I allready solder L503 but maybe i must change it no?
thanks


Yeah the originally spec'd L503 is not correct. Change it out for a 1.2mH part (part # in BOM)
- Rodney

"...you better call Kenny Loggins, 'cause you're in the danger zone."

jandoste

Re: [BUILD] GIX-51X tube preamp
« Reply #186 on: May 12, 2013, 01:03:58 PM »
Thanks Rodney!

Toure14

Re: [BUILD] GIX-51X tube preamp
« Reply #187 on: May 12, 2013, 02:27:22 PM »
Last question and my cart should be completed today and Rodney and I can send it to you for review.

"C5" and "C3" have the same capacitance rating the only difference being the Lead Spacing requirements. I read on page 2 of the thread that the leads had to be bent for "C3" at 15mm LS and currently when I search WIMA caps as according to the BOM for "C3" and "C5" at the given values .47u and 250V, only 15mm LS is available.

When I drop the voltage to 100V I get 5/7.5/10 mm LS options which would probably work much better for the CAPS spacing requirements, however the voltage drop is significant.

My question is can I use 100 volt WIMA CAPS for "C3" and "C5" instead of 250V?

gemini86

Re: [BUILD] GIX-51X tube preamp
« Reply #188 on: May 12, 2013, 02:37:10 PM »
The difference between c3 and c5 is that c3 must be 250V, where c5 can be 100V, since it is only block the DC from v1A's cathode when at low gain settings, which will be around 80V max. I'll change the bom to reflect that.

RE: c3 touching the tube pins... thepins will get warm as the tube heats up. But it's my experience that these low power tubes only get warm, not HOT. I can pull a hot tube out bare handed without discomfort. The cap's plastic housing will be rated for much higher operating temperatures. It's not exactly pretty, but it's fine.
« Last Edit: May 12, 2013, 02:40:11 PM by gemini86 »
- Rodney

"...you better call Kenny Loggins, 'cause you're in the danger zone."

Toure14

Re: [BUILD] GIX-51X tube preamp
« Reply #189 on: May 12, 2013, 02:45:58 PM »
The difference between c3 and c5 is that c3 must be 250V, where c5 can be 100V, since it is only block the DC from v1A's cathode when at low gain settings, which will be around 80V max. I'll change the bom to reflect that.

RE: c3 touching the tube pins... thepins will get warm as the tube heats up. But it's my experience that these low power tubes only get warm, not HOT. I can pull a hot tube out bare handed without discomfort. The cap's plastic housing will be rated for much higher operating temperatures. It's not exactly pretty, but it's fine.

Thanks Rodney...I'm going to go over my cart and then share it with you and then hopefully before the day is out this build can have an official Mouser cart minus the 50k Log which is from mammoth audio.


Toure14

Re: [BUILD] GIX-51X tube preamp
« Reply #190 on: May 12, 2013, 03:23:17 PM »
Okay this is just out of pure curiosity Rodney, but would 100v work for c7 instead of 63v keeping the same capacitance?

gemini86

Re: [BUILD] GIX-51X tube preamp
« Reply #191 on: May 12, 2013, 04:43:46 PM »
Higher voltage rating is always ok. If it fits, it's good.
- Rodney

"...you better call Kenny Loggins, 'cause you're in the danger zone."

Toure14

Re: [BUILD] GIX-51X tube preamp
« Reply #192 on: May 12, 2013, 05:31:35 PM »
Higher voltage rating is always ok. If it fits, it's good.

Okay thanks. I sent you an email with a link to the mouser cart I put together. If you verify everything then you can post it to the beginning of this thread for everyone to use. I followed the order of the BOM so a person can literally go right down the line item by item.

Only thing missing is the 50'k log from mammoth but i'm sure you can post a link for that right under the cart if you approve it.

I don't know how to measure the knobs or which ones to recommend to folks so i guess you can post that info in the BOM as well.

Thanks for the assistance
G

gemini86

Re: [BUILD] GIX-51X tube preamp
« Reply #193 on: May 12, 2013, 07:14:23 PM »
Looks pretty good to me. Thanks for doing that, Toure. Updated first post with the mouser cart.
- Rodney

"...you better call Kenny Loggins, 'cause you're in the danger zone."

Winetree

Re: [BUILD] GIX-51X tube preamp
« Reply #194 on: May 13, 2013, 11:48:08 AM »
Looked at first post.
Where's the Mouser Cart?

Toure14

Re: [BUILD] GIX-51X tube preamp
« Reply #195 on: May 13, 2013, 11:56:20 AM »
Looked at first post.
Where's the Mouser Cart?

I don't know how to do the whole hyper link thing where I can attach it to the words "Mouser Cart"

gemini86

Re: [BUILD] GIX-51X tube preamp
« Reply #196 on: May 13, 2013, 01:19:39 PM »
Ummm. Sorry, it was there last night but I'm not seeing my changes. I'll try again at lunch. Maybe the edit didn't go through.
- Rodney

"...you better call Kenny Loggins, 'cause you're in the danger zone."

gemini86

Re: [BUILD] GIX-51X tube preamp
« Reply #197 on: May 13, 2013, 01:41:03 PM »
there.. fixed it.
- Rodney

"...you better call Kenny Loggins, 'cause you're in the danger zone."

Re: [BUILD] GIX-51X tube preamp
« Reply #198 on: May 13, 2013, 10:35:38 PM »
Thanks for this build everyone!

Looking forward to building a pair of these.

Mine will be for male and female vocals.

Can anyone comment on tube selection or optimal input/output transformer for this application?

Thanks in advance

Cheers
Mac

gemini86

Re: [BUILD] GIX-51X tube preamp
« Reply #199 on: May 14, 2013, 05:34:45 PM »
I really like JJ tubes for new glass. Old stuff? Right now I have some used 50s rca in there. V2 doesn't seem to care about being a noisy tube. V1 might need to be selected for low noise.

Lots of people seem to prefer lundahl for the transformers.
- Rodney

"...you better call Kenny Loggins, 'cause you're in the danger zone."


 

Related Topics

  Subject / Started by Replies Last post
141 Replies
41409 Views
Last post April 24, 2019, 06:18:12 PM
by Mrosso
370 Replies
77283 Views
Last post July 23, 2019, 01:04:02 AM
by boji
232 Replies
80939 Views
Last post January 09, 2020, 04:17:23 PM
by tron23
69 Replies
12252 Views
Last post June 10, 2015, 07:04:14 AM
by delmonton