CurtPalme.com Home Theater Forum

Tim in Phoenix · Joined: 21 Oct 2006 Posts: 4379 Location: Phoenix

Guys

Any mods needed to neckboards? Any problems using LPB03s?

barclay66 · Posted: Mon Sep 19, 2016 12:13 pm Post subject:

Hi,

nope. Only difference is that the LBP's don't have the 'KH' grid (on pin 7 with a LUG tube). It is tied to ground through a 10 meg resistor. You can leave it like it is...

Regards,
barclay66

cmjohnson · Joined: 03 Apr 2006 Posts: 5180 Location: Buried under G90s

Just make sure where G2 is. It'll be on 2 or 6. Otherwise, same pinout. Should run fine, calibration may be different.

My understanding is that LPBs are higher resolution than LCPS but not as high as LUGs.

LUGs normally have G2 on pin 6. LCPs have been made with G2 on pin 2 (standard) or pin 6 (customized for AmPro)
but I don't know what's the standard for LPBs.

barclay66 · Posted: Mon Sep 19, 2016 12:19 pm Post subject:

LBPs have G2 on pin 6 just like LUGs...

cmjohnson · Joined: 03 Apr 2006 Posts: 5180 Location: Buried under G90s

Is the G90 pin base different from that as used on Barcos and Marquees?

If so, you would also want to very CAREFULLY cut the silicone between the tube glass and the pin base and carefully remove
the pin bases and put the appropriate one on the tube.

I DO mean carefully, and I DO mean gently. I've lost a tube or two in the process of doing this, but fortunately they were well
worn donor tubes. When replacing the pin base on a good tube to be used again, I was much more careful and had no problems.

barclay66 · Posted: Thu Sep 22, 2016 4:03 pm Post subject:

cmjohnson · Joined: 03 Apr 2006 Posts: 5180 Location: Buried under G90s

I'm actually asking about the plastic pin base itself. On the tube. Which may be black or white plastic. The ones used on Marquees and (at least some) Barcos have a largish "pocket" feature that contains pins 1 and 2.

There is another variety of tube base that doesn't have that pocket.

I don't know if the G90s can use the base with the pocket. If not, I have the base style without it, and they can be changed out on the tube if need be, but there is some element of risk involved.

I have plenty of those bases if anybody needs a couple.

I know that the pin assignments are the same in any case. As long as we're talking about Panasonic spec tubes,
aside from G2 being on either pin 2 or on pin 6 depending on model and options.

barclay66 · Posted: Thu Sep 22, 2016 5:36 pm Post subject:

The G90 socket does accommodate the pocket-style pin base. No problem...

cmjohnson · Joined: 03 Apr 2006 Posts: 5180 Location: Buried under G90s

Cool. Because if you don't HAVE to swap out the base, then that is of course for the best. Nobody wants to hear a tube go HISS.