Hoffman Style Board for a Princeton Reverb

[Fresh_Start]

The yellow ones all appear to be Mallory 150s, and one is a .1uf 630v.

Would this polyester film cap from Vishay be a reasonable choice for the "brown" ones Drew asked about?  http://www.mouser.com/search/refine.aspx?Ntt=75-MKT1813410635

Newark Electronics only has 125, but they have Mallory 150s (polyester film) in .1uf 630v.  Why spec something else for the blocking caps between the splitter and the power tubes?

Sorry if this is too much detail - I'm shopping!

Chip

[bnwitt]

Please be aware that there have been comments regarding the Mallory 150s being to long for the vertical spacing on the board.  I used Doug's xicons on my board and they fit perfectly.  I believe Bill Creller used them as well.  If you use the mallorys you will need to do a lead tuck on them to get them to fit or move the bottom turrets for them.  Also, the mallorys in the preamp stage could be 250 volts instead of 630 volts and they would fit.  Attached is a pic of my finished board with the Xicons.

[bnwitt]

Nice looking board Barry    ;)

Jim, I appreciate you saying that but I'm afraid it's not one of my best.  I rushed that one to get the amp ready for a recording session.  Still, it sounded great.  ;)

[billcreller]

Yeah, Doug's xicon resistors are what he sez fit the Hoffman style boards. and are what I used. In fact I used them on most of the boards I did, like National clones.

[Fresh_Start]

Since I am building not one, but two, of these beasties, some additional documentation will help me avoid/minimize mistakes.  With that in mind, I have posted a schematic to reflect all of the work done by HotBluePlates, bnwitt, and others on the "Hoffman style" layout: http://www.el34world.com/Forum/yabb2/nph-YaBB.pl?num=1163460819/0  The bias adjustment pot threw me for a while and may not be correct yet.

Please note that our friend "Tubenit" created an accurate schematic of the original Fender schematic - I just changed a few things to reflect the "Hoffman style" layout updates.

It helps me a whole lot to have both the schematic and the layout in hand while soldering, marking both with a highlighter every time I add a component or connection.

Also, I'm attaching a parts list that I hope is complete (since I've already ordered almost all of this stuff).  I can email an Excel version of the document if anyone wants one.

PLEASE let me know what corrections are needed either to the schematic or the bill of materials.

Many thanks to all of you for the work included in this thread.  Hopefully this contribution will be helpful to others.

Chip

[sluckey]

Chip, the schematic looks good except for one little niggle... the reverb pot. It'll work as you have it drawn, but if you want your schematic to reflect the work that Leo, HBP, and bnwitt did, make this small change. Swap the leads on the reverb pot high side and wiper, like this...

...Steve

[drew]

Have any of you guys seen one of the reproduction Princeton Reverb chassis/faceplates/etc. packages sold by user "noojwut" on Ebay?  
Are they any good?  The guy is apparently in Thailand, and sells packages for several of the blackface amps, doling them out a few at a time.  I did a search here and found one post by a guy who seemed reasonably happy with a Deluxe Reverb one he got.

[HotBluePlates]

I've seen them on the website, and they look okay. You just need to make sure they fit whatever cabinet you plan to use. And naturally, if you use the fiberboard supplied, you can just use the original Fender layout.

That guy is a little interesting. "Item location" says Bangkok, Thailand, but the items look like stuff you could buy from Mojo or the like, and a search by his Ebay ID says he is in California.

[EL34]

* EL34 - This post has gotten really long and hard to sift through for the diagrams. I added a condensed post here with just the diagrams.

http://www.el34world.com/Forum/index.php?topic=4770.0