Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Hazcat on December 22, 2021, 02:20:12 pm
-
I'm making progress on my AB763 build - I'm building the One Channel version, adding dwell, presence and master volume per robrob's guidance.
I'll post some pics after this Christmas bustle, but I have one quick question right now - I'm building a Deluxe, but I bought 22mfd filters rather than the 16's that are called for in the Deluxe - I missed that distinction when I made my AB763 BOM order. Is that added capacitance going to give me problems or affect tone? I understand the basics of tube theory, but I've read a lot posts here, robrob and Aiken that bring up finer points that I had never considered (self-taught technician, here). Now I'm kind of gun-shy about changes. I know the GZ34 can provide the current, but my Hammond PT is rated at 660VCT @ 138mA. Is there a rule of thumb for supply current increase with capacitance? The schematic calls for 5 x 16mfd (1st two are parallel).
Edit Subject line... sluckey
-
When I started buying high voltage caps in the 80s, electrolytic types had a +100% to -50% tolerance. So 16 nominal might be anywhere between 8 and 32, 22 nominal 11 - 44.
There’s quite a lot of overlap.
I wouldn’t worry about it.
-
Nice build! I'm working on a 6G3 rebuild and I intentionally upped the 16uF's to 22uF's.
I'm guessing you just haven't added wires between pins 2 and 7 on the two power tube sockets yet, but will.
-
When I started buying high voltage caps in the 80s,
about 10 years ago I got notice that I was/could be in a class action lawsuit because I was buying caps in the 80's/90's.
I ticked the ya sure box, 2 years later I got an 87cent check! :laugh: I coulda had actual dollars but couldn't provide receipts for about 80% of the buys I did. Believe it was a "price gouge" suit, somewhere FarEast of America
-
When I started buying high voltage caps in the 80s,
about 10 years ago I got notice that I was/could be in a class action lawsuit because I was buying caps in the 80's/90's.
I ticked the ya sure box, 2 years later I got an 87cent check! :laugh: I coulda had actual dollars but couldn't provide receipts for about 80% of the buys I did. Believe it was a "price gouge" suit, somewhere FarEast of America
LRF lawsuit (Lawyer Relief Fund) :l2:
-
When I started buying high voltage caps in the 80s,
about 10 years ago I got notice that I was/could be in a class action lawsuit because I was buying caps in the 80's/90's.
I ticked the ya sure box, 2 years later I got an 87cent check! :laugh: I coulda had actual dollars but couldn't provide receipts for about 80% of the buys I did. Believe it was a "price gouge" suit, somewhere FarEast of America
Looking for things I could buy with 87Cents ummm ummm yep Nothing Lmao
I remember that lawsuit I got notice as well but never followed up dang I might could of got like 55Cents that half a dang candybar.
-
Hi, if it were me I would wire up the board to sockets pots jacks etc before installing components. Nice work so far hope she fires up fine first time.
I've built several DRs one and two channels and repaired vintage amps in my time and I have not perceived any difference in 16uf filters vs 20 or 22uf filters.
-
Hi, if it were me I would wire up the board to sockets pots jacks etc before installing components.
Why?
Fender and others always filled the eyelet/turret board 1st and had fly leads on the board to make the connections to the pots, tube sockets, etc. after installing the already populated board.
It's faster and easier to populate the board outside of the chassis. More room to move outside the chassis.