Digging through my parts bin I have everything I need to turn this Princeton Chassis into an Hybrid. It's a real honeymoon fit (real tight) but I think it may be possible.
A few notes. I'll change the switches to relay on PAB and mid boost. The master will also be push pull for channel switching so there will be 3 relays lengthwise by the pots.
Where it looks like there's room for the diode board above the PT there's only room for the pilot light and the relay supply. I have the diodes mounted on the edge of the chassis.
All the filters are cans. I have a 2x50 for the main and a 4x20 for the rest. At the lower voltage of this PT 450 will be more than enough.
Thoughts?
Last edited by Bob-I on Wed Jul 19, 2006 3:56 am, edited 2 times in total.
Thanks for all the great postings and being such an active part of this forum.
I was just curious if you have a "final" version of the schematic that you use for your Non-HRM amps? I know that you have done a lot of experimenting and testing with both versions.
You mentioned in a prior post that you were going to submit an update. I have been actively following the advice of yourself, Dogears, and Normster.
Thanks for all the great postings and being such an active part of this forum.
I was just curious if you have a "final" version of the schematic that you use for your Non-HRM amps? I know that you have done a lot of experimenting and testing with both versions.
You mentioned in a prior post that you were going to submit an update. I have been actively following the advice of yourself, Dogears, and Normster.
Thanks,
Goerge
George,
I'm happy to help, but to date I haven't actually completed a schematic. Thx for your reminder... I'll get on that.
About the closest I've come is the 3 channel schematic in the files section, just ignore channel 1, that's a Super Reverb.
I have sort of settled on some new values...... Start with Hybrid A.
I use 5uf on CL1 but a 10uf on CL2. 5uf on OD1 and OD2. I like the big explosive bottom. 500pf to bypass CL2 grid. 180k resistor above the 100k OD trimmer. .02 to .05 on CL2 coupler based on taste. Or .05 with another .05 that is in series before the 180k series resistor. To net .025 in OD mode. 5.6pf bright cap on master. 100k linear pots on gain and ratio. Skyline tonestack. 110k/120k on PI plates if you use a 10k trimmer. 270pf to 330pf snubbers to taste.
RN65 resistors on plates and PS Orange Drops. Remember the 150k to ground to simulate the FET loading....
George Adzich wrote:Bob,
Thanks for all the great postings and being such an active part of this forum.
I was just curious if you have a "final" version of the schematic that you use for your Non-HRM amps? I know that you have done a lot of experimenting and testing with both versions.
You mentioned in a prior post that you were going to submit an update. I have been actively following the advice of yourself, Dogears, and Normster.
Normster wrote:Looks good, Bob. I like the cap can idea and I'm planning to use them myself on my 6V6 build. (But doesn't the Princeton have a doghouse?)
No doghouse on the Princeton, just a can cap with 4 - 20uF 475V caps in it. As you can see I replaced the rectifier tube with a 2 -50uF can for the first stage filters, then I'll use the 20uF's for the rest.
I'll make 2 changes to this layout. The terminal strips next to the can cap will be moved above the can, and the trim pot will be mounted between V1 and V2 through the chassis, there's a hole there already. This'll save room on the board.
glasman wrote:Hi Bob, question, as you said a Hybrid. Is the R and C for OD2 off board or just missing?
Gary
Missing Thx.
I'm actually re-working this some so I'll make the correction on the next version. I'm moving the OD entrance off board to make the board line up better with the tube location, plus changing to a Hybrid type entrance instead of the HRM style shown.
glasman wrote:Hi Bob, question, as you said a Hybrid. Is the R and C for OD2 off board or just missing?
Gary
Missing Thx.
I'm actually re-working this some so I'll make the correction on the next version. I'm moving the OD entrance off board to make the board line up better with the tube location, plus changing to a Hybrid type entrance instead of the HRM style shown.
Very cool,.
There is nothing I like more than to be loading a board and then realize I left off ONE part. This has happened more than once. Also nothing like adding an eyelet to an already loaded board.
Gary
Located in the St Croix River Valley- Afton, MN
About 5 miles south of I-94
aka K0GWA, K0 Glas Werks Amplification www.glaswerks.com
I completed another version. Many changes including moving the switches to relays and off the pots. Turns out the push pull pots won't fit in this tiny chassis so I'll be using micro switches between 16mm pots.
740]http://www.patmedia.net/bob-ingram/DClo ... Layout.jpg[/img]
Thx. 
