trinityamps.com

Trinity Amps Guitar Amp Forum
It is currently Thu Jul 29, 2021 4:56 pm

All times are UTC - 5 hours [ DST ]




Post new topic Reply to topic  [ 26 posts ]  Go to page 1, 2  Next
Author Message
PostPosted: Thu Nov 05, 2020 10:15 pm 
Offline
Friend
Friend

Joined: Thu Sep 27, 2012 9:29 am
Posts: 23
I've been dabbling in electronics for many years. Did a bunch of Monte Allums pedal mods, upgraded a VHT Special 6 Ultra, and modified 4 Fender Blues Jr's (billm), converted one of them from EL84's to 6v6/5881/6L6. Super fun!

So I figured it was time to do a complete build. I've also began doing more woodworking lately so looking forward to building the head cab and speaker cab; box joints, routing, etc.

I'll try to document this the best I can for posterity and to help other builders... just like a few of the other threads will no doubt help me.


Attachments:
IMG_1120.jpg
IMG_1120.jpg [ 1.86 MiB | Viewed 2538 times ]
Top
 Profile  
 
PostPosted: Fri Nov 06, 2020 1:43 pm 
Offline
Experienced
Experienced

Joined: Wed Sep 12, 2018 5:17 pm
Posts: 367
Location: Shawnee, OK
Congats! Think you'll like it. If you plan to build with the KT88/EL34 option be sure to check pg. 68 of the build guide. Also, Coco will e-mail you the plans for a head cab (if you haven't already got them from him). Looking forward to your build posts.

_________________
"The only problem with being retired is you never get a day off"


Top
 Profile  
 
PostPosted: Tue Nov 17, 2020 11:33 pm 
Offline
Friend
Friend

Joined: Thu Sep 27, 2012 9:29 am
Posts: 23
Question: the Power Level pot should be a 1M-L. But the pot I have is a A1M, same as the Master Volume except it has the 2 extra pots on the back. Is the correct? Or the wrong pot?

The BOM says: Alpha 1M Audio with switch, that is what came with the kit. Maybe the schematic is wrong. Should it say 1M-A instead of 1M-L?


Top
 Profile  
 
PostPosted: Wed Nov 18, 2020 5:54 pm 
Offline
Experienced
Experienced

Joined: Wed Sep 12, 2018 5:17 pm
Posts: 367
Location: Shawnee, OK
Don't know about the markings, however, the Power Level pot is twice as thick as a normal pot and should have 3 VRM connections on the aluminum section and 2 power connections on the black portion of the pot. There IS a 1M audio taper, but it goes in the Master Volume position next to the Power Level pot. Hope this clarifies things :thumbsup: Also, look through the Tramp forum for build pictures.

_________________
"The only problem with being retired is you never get a day off"


Top
 Profile  
 
PostPosted: Wed Nov 18, 2020 6:06 pm 
Offline
Experienced
Experienced

Joined: Wed Sep 12, 2018 5:17 pm
Posts: 367
Location: Shawnee, OK
The Layout sheet is your friend :!: :!:

_________________
"The only problem with being retired is you never get a day off"


Top
 Profile  
 
PostPosted: Wed Nov 18, 2020 8:55 pm 
Offline
Friend
Friend

Joined: Thu Sep 27, 2012 9:29 am
Posts: 23
Hankules wrote:
The Layout sheet is your friend :!: :!:


Well, I'm reasonably convinced that the BOM is correct and I have the right pot, and that the Layout is wrong. Reading up on audio taper pots, they are pretty typical for most amp dials and very appropriate for the power level.


Top
 Profile  
 
PostPosted: Wed Nov 18, 2020 8:58 pm 
Offline
Friend
Friend

Joined: Thu Sep 27, 2012 9:29 am
Posts: 23
Tonight, I installed all the hardware!

Attachment:
IMG_1157.jpg
IMG_1157.jpg [ 2.58 MiB | Viewed 2426 times ]

Attachment:
IMG_1158.jpg
IMG_1158.jpg [ 1.03 MiB | Viewed 2426 times ]

Attachment:
IMG_1159.jpg
IMG_1159.jpg [ 1.07 MiB | Viewed 2426 times ]

Attachment:
IMG_1160.jpg
IMG_1160.jpg [ 1.04 MiB | Viewed 2426 times ]


Top
 Profile  
 
PostPosted: Wed Nov 18, 2020 9:00 pm 
Offline
Friend
Friend

Joined: Thu Sep 27, 2012 9:29 am
Posts: 23
Also soldered the heater wires in... had to remove the fuse socket first.

Attachment:
File comment: Preamp Tube Wiring
Preamp-Tube-1.jpg
Preamp-Tube-1.jpg [ 1.29 MiB | Viewed 2418 times ]

Attachment:
Heater-Wires.jpg
Heater-Wires.jpg [ 1.68 MiB | Viewed 2418 times ]


Attachments:
Power-Tube-1.jpg
Power-Tube-1.jpg [ 2.24 MiB | Viewed 2418 times ]
Top
 Profile  
 
PostPosted: Mon Nov 23, 2020 9:41 am 
Offline
Friend
Friend

Joined: Thu Sep 27, 2012 9:29 am
Posts: 23
Got the transformers installed and the PT wired.

Attachment:
File comment: LED Resistor
LED-Resistor.jpg
LED-Resistor.jpg [ 2.89 MiB | Viewed 2375 times ]

Attachment:
File comment: LED Wires
LED-Wires.jpg
LED-Wires.jpg [ 3.05 MiB | Viewed 2375 times ]

Attachment:
File comment: Transformers and Stand
TransformersInstalledOnStand.jpg
TransformersInstalledOnStand.jpg [ 1.85 MiB | Viewed 2375 times ]

Attachment:
File comment: Fuse and PT wiring
FUSE.jpg
FUSE.jpg [ 2.73 MiB | Viewed 2375 times ]

Attachment:
File comment: PT
PowerTransformer1.jpg
PowerTransformer1.jpg [ 2.49 MiB | Viewed 2375 times ]


Top
 Profile  
 
PostPosted: Wed Nov 25, 2020 9:24 am 
Offline
Friend
Friend

Joined: Thu Sep 27, 2012 9:29 am
Posts: 23
Wired up the OT.

Attachment:
File comment: Output Jacks and Impedance Selector
OutputJacksAndImpedanceSelector.jpg
OutputJacksAndImpedanceSelector.jpg [ 1.49 MiB | Viewed 2366 times ]

Attachment:
File comment: Output Transformer Wiring
OT-wiring.jpg
OT-wiring.jpg [ 2.62 MiB | Viewed 2366 times ]


Top
 Profile  
 
PostPosted: Wed Nov 25, 2020 9:28 am 
Offline
Friend
Friend

Joined: Thu Sep 27, 2012 9:29 am
Posts: 23
Question. The 10k resistor across pins 5 and 6 of the octal. I didn't receive a 2W resistor like the layout and instructions say, but I did receive a blue 10k 1/2W resistor. Is that sufficient? If not, I can get them from Amazon for a few bucks.


Top
 Profile  
 
PostPosted: Thu Nov 26, 2020 3:22 pm 
Offline
Experienced
Experienced

Joined: Wed Sep 12, 2018 5:17 pm
Posts: 367
Location: Shawnee, OK
Would recommend the you get the power resistor (10K 2W) or PM Coco (Stephen) to send one. What does the one you have look like (maybe a pic) ?

_________________
"The only problem with being retired is you never get a day off"


Top
 Profile  
 
PostPosted: Fri Nov 27, 2020 6:39 pm 
Offline
Friend
Friend

Joined: Thu Sep 27, 2012 9:29 am
Posts: 23
Hankules wrote:
Would recommend the you get the power resistor (10K 2W) or PM Coco (Stephen) to send one. What does the one you have look like (maybe a pic) ?


I ordered a pack from Amazon. The 10k that came with it is small and blue. The ones in the Builders Guide picture are larger and grey like the 1k resistors near/on the octal terminal.


Top
 Profile  
 
PostPosted: Fri Nov 27, 2020 6:40 pm 
Offline
Friend
Friend

Joined: Thu Sep 27, 2012 9:29 am
Posts: 23
On page 45 of the builders guide, it says: Note: Make sure the cathode bias resistors for the power tubes are separated from the bypass
cap and slightly raised off the board as this resistor can emit some heat.

Which ones are the cathode bias resistors?


Top
 Profile  
 
PostPosted: Fri Nov 27, 2020 11:27 pm 
Offline
Experienced
Experienced

Joined: Wed Sep 12, 2018 5:17 pm
Posts: 367
Location: Shawnee, OK
That would be the 570 and 750 Ohm 5W resistors next to the 1000uF 50V electrolytic. Find something to rest them on that you can slide out after you solder them into the eyelet board (to separate them from the board). I used a small piece of metal flashing EDIT: or a thin coin. They can get pretty warm :!: H. Schepers

_________________
"The only problem with being retired is you never get a day off"


Top
 Profile  
 
PostPosted: Mon Nov 30, 2020 12:07 pm 
Offline
Friend
Friend

Joined: Thu Sep 27, 2012 9:29 am
Posts: 23
Why is the MOSFET bolted down to the chassis? Why not just solder it onto the eyelet board?


Top
 Profile  
 
PostPosted: Mon Nov 30, 2020 7:09 pm 
Offline
Experienced
Experienced

Joined: Wed Sep 12, 2018 5:17 pm
Posts: 367
Location: Shawnee, OK
Chassis acts as a heatsink. Don't forget the Sil-pad, it isolates the MOSFET electrically. The MOSFET installation is a PITA because of the method used to attach the center leg to the eyelet board; the second method mentioned looks a lot easier. If I ever build another Tramp, that's how I'm gonna do it. I was careful and used heat sinks when I soldered them into the board.

_________________
"The only problem with being retired is you never get a day off"


Top
 Profile  
 
PostPosted: Mon Nov 30, 2020 7:22 pm 
Offline
Friend
Friend

Joined: Thu Sep 27, 2012 9:29 am
Posts: 23
Hankules wrote:
Chassis acts as a heatsink. Don't forget the Sil-pad, it isolates the MOSFET electrically. The MOSFET installation is a PITA because of the method used to attach the center leg to the eyelet board; the second method mentioned looks a lot easier. If I ever build another Tramp, that's how I'm gonna do it. I was careful and used heat sinks when I soldered them into the board.


Ah, right. Yeah the 2nd method mentioned is for a Head, which I am forced to use. Yes it looks easier.
Thanks!


Top
 Profile  
 
PostPosted: Mon Nov 30, 2020 10:21 pm 
Offline
Experienced
Experienced

Joined: Wed Sep 12, 2018 5:17 pm
Posts: 367
Location: Shawnee, OK
sorry, the method I meant was the one where Coco says you can mount the MOSFET away from the board and run wires to the board instead of a direct connection to the MOSFET leads. I've only built the combo versions and heard the head version has some tight spots. Check out the pic in this post trinityamps.com/phpbb/viewtopic.php?f=16&t=5695

_________________
"The only problem with being retired is you never get a day off"


Top
 Profile  
 
PostPosted: Tue Dec 01, 2020 9:14 am 
Offline
Friend
Friend

Joined: Thu Sep 27, 2012 9:29 am
Posts: 23
Finished the eyelet board this weekend.

Attachment:
File comment: Eyelet jumpers on the back
Eyelet-Jumpers.jpg
Eyelet-Jumpers.jpg [ 1.68 MiB | Viewed 2321 times ]

Attachment:
File comment: Top of Eyelet board with leads
Eyelet-Top.jpg
Eyelet-Top.jpg [ 2.29 MiB | Viewed 2321 times ]

Attachment:
File comment: Eyelet back, decided to put a couple resistors back there because they didn't fit so well on the top.
Eyelet-Back.jpg
Eyelet-Back.jpg [ 2.09 MiB | Viewed 2321 times ]

Attachment:
File comment: Mosfet side of the eyelet board
Eyelet-Mosfet-Side.jpg
Eyelet-Mosfet-Side.jpg [ 1.77 MiB | Viewed 2321 times ]

Attachment:
File comment: Right side of the eyelet board
Eyelet-Right.jpg
Eyelet-Right.jpg [ 1.83 MiB | Viewed 2321 times ]


Attachments:
File comment: Used 1/8" hardboard as a standoff for the ceramic resistors
Ceramic-Standoffs.jpg
Ceramic-Standoffs.jpg [ 1.37 MiB | Viewed 2321 times ]
Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 26 posts ]  Go to page 1, 2  Next

All times are UTC - 5 hours [ DST ]


Who is online

Users browsing this forum: No registered users and 5 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
cron
Powered by phpBB® Forum Software © phpBB Group