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Post subject: Re: My Weber 5F6A Bassman Build-Up Thread
Posted: Wed Dec 28, 2011 11:49 pm
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Well, today was a fun day (It is now 1:30 am Thursday morning).

I spent most of the day making repairs to the utility room door frame and surrounding walls. Our 11 year old Golden Retriever, Annie, is absolutely terrified of thunderstorms. She will try to chew her way through the utility room door to hide. Not a good thing since the furnace, gas hot water heater and washer and drier are in there. I have repaired things several times now and have "armor plated" things with plexiglass and heavy plastic corner protectors. I still have a couple more work to do.

Then I had to change spark plugs in my wife's car. Of course, after I was finished the car would not start so I had to get a friend to jump it. Oh, well.

Finally after dinner I was able to open up the box of amp parts. I did a complete inventory of things (Nothing was missing!), labled all the resistors and put the small parts into separate baggies. The parts all seem to be of decent quality. The pots are Alphas, and although I would have preferred CTS, I think these will be fine. The tube sockets are nice ceramic parts. Resistors are carbon film.

I do have to check on one thing though:

There are three 470 ohm resistors in the kit. Two 1 watt and one 1/2 watt. I figured out which was which by comparing resistor leads (one had longer leads than the other two). My concern is that all three resistors are the same physical size. Does it seem reasonable that a 470 ohm 1 watt resistor would be the same size as a 470 ohm 1/2 watt resistor? I'm going to check with Weber, but if anyone here knows the answer, I would greatly appreciate it.

Time for bed. Hopefully I can start mounting components today (tomorrow? tonight?) and maybe even solder something together. I do have to put a new tip on my 25 watt iron, though.

Stay tuned. More fun to follow. :D

Edit: Resistors are carbon film, not carbon comp. 2:00 am typo. :lol:

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Last edited by bluesky636 on Thu Dec 29, 2011 6:31 am, edited 1 time in total.

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Post subject: Re: My Weber 5F6A Bassman Build-Up Thread
Posted: Thu Dec 29, 2011 3:01 am
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Resistor ; different brand and / or material could be same size for 1 watt and 1/2 watt. But you say they are same material , it should be different brand or Weber put 3 x 1 watt in the kit to make it easier ?


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Post subject: Re: My Weber 5F6A Bassman Build-Up Thread
Posted: Thu Dec 29, 2011 11:46 am
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stratele52 wrote:
Resistor ; different brand and / or material could be same size for 1 watt and 1/2 watt. But you say they are same material , it should be different brand or Weber put 3 x 1 watt in the kit to make it easier ?


I just heard back from Weber. Even though the parts list includes 1/2, 1, and 2 watt resistors, all resistors supplied are either 1 watt or 2 watts. They do not provide 1/2 watt resistors. The reason given was because the 1 watt resistor temperature rating is higher which results in less thermal noise.

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Last edited by bluesky636 on Thu Dec 29, 2011 3:31 pm, edited 1 time in total.

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Post subject: Re: My Weber 5F6A Bassman Build-Up Thread
Posted: Thu Dec 29, 2011 2:35 pm
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They do a good job , an amp kit with 1 or 2 watts resistors, this is serious.


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Post subject: Re: My Weber 5F6A Bassman Build-Up Thread
Posted: Thu Dec 29, 2011 5:50 pm
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Good luck with that build. I built a Marsh Tweed Twin kit this past summer. You really don't need directions as much as the layout. Of course, the Marsh kit did come with each component labelled which helped immensely. Just don't oversolder and you'll be fine with it.


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Post subject: Re: My Weber 5F6A Bassman Build-Up Thread
Posted: Sat Dec 31, 2011 8:07 am
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dvlsadvc8t wrote:
I built a Marsh Tweed Twin kit this past summer.


Where did you get your kit from. I was looking to build a JTM45 kit.

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Post subject: Re: My Weber 5F6A Bassman Build-Up Thread
Posted: Sat Dec 31, 2011 8:54 am
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BLUESMAN1904 wrote:
dvlsadvc8t wrote:
I built a Marsh Tweed Twin kit this past summer.


Where did you get your kit from. I was looking to build a JTM45 kit.


Please start a new thread if you wish to discuss this as opposed to hi-jacking mine. Thanks.

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Post subject: Re: My Weber 5F6A Bassman Build-Up Thread
Posted: Sat Dec 31, 2011 9:00 am
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Please accept my appologies. :oops: I should have sent a PM.

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2000 American Deluxe Stratocaster
2011 Gibson Les Paul Trad Pro 50's
2007 Epi Les Paul Custom
90's ESP Eclipse
JH-1B Jimi Hendrix Crybaby
Analogman KOT
Korg Pitchblack
Boss NS-2 PH-2
Blues Deluxe Reissue
1999 & 2007 Marshall TSL 100 w/1960BV cab


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Post subject: Re: My Weber 5F6A Bassman Build-Up Thread
Posted: Sat Dec 31, 2011 10:35 am
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Location: Natural Bridge, Virginia
BLUESMAN1904 wrote:
Please accept my appologies. :oops: I should have sent a PM.


Hey, no problem. :D

I hope to have something worth reporting on my build by tomorrow evening.

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Post subject: Re: My Weber 5F6A Bassman Build-Up Thread
Posted: Sun Jan 01, 2012 7:13 pm
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Ok. Finally finished all my home and car repairs I had to do this week. Well, finished enough that I don't feel guilty saying I'll finish up next weekend ..... or maybe the weekend after. :lol:

Anyway, I started about 2:00 pm today assembling the chassis. I took an hour break to walk my dogs, and some time for taking care of the laundry (no rest etc. etc.), so it is now 8:50 pm.

The chassis went together pretty well. There are a lot more parts that it would appear.

The only real problem I had was with the copper plate (makes for a good ground plane to solder to) that the pots and input jacks mount to. The holes for the input jacks did not match up exactly with those in the main chassis, so I had to use a Dremel tool with a small sanding drum to open up the holes in the copper plate. Took a few tries to get it right. Also, the pots come with two sets of washers and nuts. One set to mount them to the copper plate and the other set to mount the whole assembly to the chassis. The input jacks only had one set of washers and nuts, so I had to spend some time digging through my bags of spare parts. Finally found another complete set of 4 to use. Also, the plastic insert in one of the phono jacks used for speaker connectors came out, and I had to super glue it back into place.

So, here is the chassis from the front showing the pots, switches, and inputs (note that the ground switch is for show only and is not connected to anything). The power transformer is to the left with the choke in the middle and the OT on the right.

Image

Here is the back of the chassis showing the tube sockets and 4 output jacks.

Image

Finally, here is the underside of the chassis with a bunch of loose wires. :lol:

Image

I am trying to decide how to best ground everything. Some assembly photos show the terminals of the pots and input jacks that are grounded soldered to the copper plate with a short piece of wire. Since the pots and jacks are mounted directly to the plate and make a good connection, it seems that adding a wire would only clutter things up more and possibly cause a ground loop. I would think a wire from the pot terminal to the back of the pot would be sufficient with no additional ground wire needed on the input jacks. I am open to any suggestions on how to ground everything.

Since there are no instructions included as far as assembly order, I fully expect to have to remove and replace some components as I wire things up and install the Eyelet board.

Next step: Populating and wiring the eyelet board. Stay tuned for more fun and games. :D

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Last edited by bluesky636 on Sat Nov 03, 2012 10:11 am, edited 1 time in total.

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Post subject: Re: My Weber 5F6A Bassman Build-Up Thread
Posted: Sun Jan 01, 2012 7:29 pm
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Wish I had a pic, but I ran a ground bus from the input jacks, across the pots, and grounded on one of the posts of the power tranny. This eliminated the need for the copper plate. I also did the same from the speaker jack to the power tubes to a different corner post of the power tranny.


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Post subject: Re: My Weber 5F6A Bassman Build-Up Thread
Posted: Sun Jan 01, 2012 8:10 pm
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Location: Natural Bridge, Virginia
dvlsadvc8t wrote:
Wish I had a pic, but I ran a ground bus from the input jacks, across the pots, and grounded on one of the posts of the power tranny. This eliminated the need for the copper plate. I also did the same from the speaker jack to the power tubes to a different corner post of the power tranny.


That is an excellent idea. I think I will do the same. Did you use a bare copper rod or just wire from jack to pot to pot?

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Post subject: Re: My Weber 5F6A Bassman Build-Up Thread
Posted: Sun Jan 01, 2012 8:16 pm
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bluesky636 wrote:
dvlsadvc8t wrote:
Wish I had a pic, but I ran a ground bus from the input jacks, across the pots, and grounded on one of the posts of the power tranny. This eliminated the need for the copper plate. I also did the same from the speaker jack to the power tubes to a different corner post of the power tranny.


That is an excellent idea. I think I will do the same. Did you use a bare copper rod or just wire from jack to pot to pot?


Just wire so I could weave it in and out of the pots.


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Post subject: Re: My Weber 5F6A Bassman Build-Up Thread
Posted: Sun Jan 01, 2012 8:26 pm
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dvlsadvc8t wrote:
bluesky636 wrote:
dvlsadvc8t wrote:
Wish I had a pic, but I ran a ground bus from the input jacks, across the pots, and grounded on one of the posts of the power tranny. This eliminated the need for the copper plate. I also did the same from the speaker jack to the power tubes to a different corner post of the power tranny.


That is an excellent idea. I think I will do the same. Did you use a bare copper rod or just wire from jack to pot to pot?


Just wire so I could weave it in and out of the pots.


Ok. I have some larger gauge wire stashed in my tool box that would serve as a good buss. I have been reading a few articles on grounding and I think this may be easier to do (at least easier to solder to) than the brass plate (I said copper earlier. My error.).

Do you think it would be a good idea to isolate the input jacks from the chassis and run the ground separate? I have the isolating washers, would just need to drill the holes larger.

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Post subject: Re: My Weber 5F6A Bassman Build-Up Thread
Posted: Sun Jan 01, 2012 8:34 pm
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bluesky636 wrote:
Do you think it would be a good idea to isolate the input jacks from the chassis and run the ground separate? I have the isolating washers, would just need to drill the holes larger.


I didn't and have no grounding issue or any noise issue associated with it. In fact, I just put the jacks in flush to the chasis then tightened them down.


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