5F6-A 2204 Build

[Chris-in-LA]

I got the itch reading the recent build threads and I couldn’t resist. I was thinking about building a 4x10 cab but decided to add a little more money and ordered a Bassman kit from Mojotone, speakers from Weber. Since I already have a number of amps without a master volume and really can’t play them much at home, I decided to build this Bassman with a 2204 front end. These amps can be loud so I decided to experiment. The layout of the 5F6A is not that much different from the 2204 and I like the way that the volume controls work on the 2204. I ordered the kit last Monday and already received the parts, the case arrives by Monday.





The only thing I don’t like about Mojotone tweed kits is that you have to figure out where to drill the holes for the circuit boards. Once that was done, I mounted the transformers and tube sockets.

 

[neikeel]

Where is the popcorn emoticon?

 

[Trouble]

 

[Chris-in-LA]

Do you guys think it matters? Should I wire the heaters in Fender or Marshall style?

 

[Trouble]

I don't think it matters my last couple fender builds I used the Marshall style.

 

[thetragichero]

either way can work well when done well. my most recent build is a combo of both since the power tubes and phase inverter are close together while the preamp tube is much farther away from them (pentode preamp). i generally base it on how i see the rest of the amp going together

 

[neikeel]

Do you guys think it matters? Should I wire the heaters in Fender or Marshall style?

I'd go Fender style throughout.

 

[Chris-in-LA]

I'd go Fender style throughout.

Ok, Fender style but it looks like it doesn’t really matter. Did a little work on the power section while waiting for this answer. BTW, what is the purpose of that .047 cap on the standby switch?

 

[adew1]

I've got my popcorn ready too. Looking forward to seeing what you come up with!

 

[Chris-in-LA]

Hey, FedEx delivered this today, on a Sunday.

 

[Trouble]

I think they put a cap on the standby to eliminate a loud pop when switching.

 

[Ivan H]

I think they put a cap on the standby to eliminate a loud pop when switching.

That's it.
Looking forward to the seeing the build progress. Cheers

 

[thetragichero]

cap likely prevents arching, although I'm not sure if I've seen on a standby switch (unless it's pre-rectifier). i use on the mains power switch (i usually don't use a standby switch)
unless it's to ground after the rectifier, i have seen that

 

[Chris-in-LA]

cap likely prevents arching, although I'm not sure if I've seen on a standby switch (unless it's pre-rectifier). i use on the mains power switch (i usually don't use a standby switch)
unless it's to ground after the rectifier, i have seen that

Yes, it’s to ground after the rectifier.

 

[thetragichero]

it's to protect the rectifier
this is a good read: http://www.valvewizard.co.uk/standby.html

 

[South Park]

It works like a soft start to me the cap charges up first then goes to the power rail . Some old school stuff you still find . So if you build the cascade input are you going to have the all the inputs or just two 6l6 or el34 power

 

[Chris-in-LA]

It works like a soft start to me the cap charges up first then goes to the power rail . Some old school stuff you still find . So if you build the cascade input are you going to have the all the inputs or just two 6l6 or el34 power

Two inputs wired like a 2204 with Cliff jacks.

 

[Chris-in-LA]

Finished wiring the preamp section. I had a bunch of Valvestorm wire leftover from some previous builds and couldn’t resist using it. I also had to drill out the input jack holes to fit the Cliff jacks.

 

[Chris-in-LA]

The board is finished, just need to check all the connections after a good nights sleep. Next step is to wire the heaters and put in the pots.

 

[Chris-in-LA]

Damn, just noticed that I put that filter cap in backwards.