Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: leegold on December 02, 2019, 04:56:31 pm

Title: Grounding 6V6 Plexi
Post by: leegold on December 02, 2019, 04:56:31 pm: Hi, I circled it in red. I don't see on the layout diagram how these points are grounded. I assume the two groups I circled of connected turrets would each have a wire to the ground? Thanks.
Title: Re: Grounding 6V6 Plexi
Post by: sluckey on December 02, 2019, 05:16:55 pm: Your big circle is grounded. Look closely. The small circle is not supposed to be grounded.
Title: Re: Grounding 6V6 Plexi
Post by: dude on December 02, 2019, 06:45:01 pm: The dotted wire under the board is connected to the negative side of the cap which is grounded to the input jack that is grounded to the chassis on the preamp side.
Sorry Sluckey, l know you like to get one to think it out, figure the solution on their own, probably a good learning tool. :icon_biggrin:
Title: Re: Grounding 6V6 Plexi
Post by: EL34 on December 03, 2019, 05:33:42 am: Quote from: leegold on December 02, 2019, 04:56:31 pm
Hi, I circled it in red. I don't see on the layout diagram how these points are grounded. I assume the two groups I circled of connected turrets would each have a wire to the ground? Thanks.

You need to slow down and look at all the documents on the library page for that board
https://el34world.com/schematics.htm#Hoffman_Plexi_6V6 (https://el34world.com/schematics.htm#Hoffman_Plexi_6V6)

One of them is this one
https://el34world.com/Hoffman/files/CommonHookups.pdf (https://el34world.com/Hoffman/files/CommonHookups.pdf)

In the upper left of that document, it shows what those dotted lines are
Title: Re: Grounding 6V6 Plexi
Post by: leegold on December 03, 2019, 10:54:04 am: It's my bad. Thanks to posters for the help.
Title: Re: Grounding 6V6 Plexi
Post by: leegold on December 09, 2019, 04:39:10 pm: Can I add one more ques? It may be a simplistic question, but please know I'm quite safety conscious and have spent many a day in the guts of Fender Silverfaces though I've never done a kit . Just want to be totally straight on this.

So, the big red circle in a layout pic above and let's say the buss wire on the pot cases et al. is all grounded via the input jack, the input jack ground tab is itself grounded to the case ect. Right?
Title: Re: Grounding 6V6 Plexi
Post by: sluckey on December 09, 2019, 05:23:29 pm: yes
Title: Re: Grounding 6V6 Plexi
Post by: glass54 on December 09, 2019, 05:40:36 pm: Make sure you have good/clean metal contact behind front panel at Jack Socket hole. Some people use a heavy duty star washer between socket and chassis :icon_biggrin:
Title: Re: Grounding 6V6 Plexi
Post by: sluckey on December 09, 2019, 06:47:11 pm: I don't like to rely on the input jack for the preamp/buss chassis ground point. Seen too many loose jacks. I use a dedicated ground lug bolted to the chassis near the input jack. like this...
Title: Re: Grounding 6V6 Plexi
Post by: glass54 on December 09, 2019, 08:14:35 pm: I agree entirely. For my scratch build I used Doug's #8B Ring Terminal. Gives you a permanent and reliable earthpoint.