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Post subject: Re: Trying to buy my 1st Vintage Amp
Posted: Sat Jan 28, 2017 6:17 pm
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sfceric64 wrote:
I don't think there is a problem w/ the original, but thought it'd make a good spare to have around.


A wise decision. Like stocking up on a few critical parts for a vintage firearm (like an M-1 Garand or a 1911 pistol).

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Post subject: Re: Trying to buy my 1st Vintage Amp
Posted: Sun Jan 29, 2017 8:36 am
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Very nice amp!

One suggestion... check those (I'd actually replace) wax covered paper coupling capacitors. Nearly every one of these that are over a few decades old leak DC voltage. I'd use Red Vintage "Astron" caps made by Jupiter. These maintain the vintage tone.

This will also save any precious NOS tubes you may choose to use.

http://www.partsconnexion.com/capacitor ... stron.html

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Post subject: Re: Trying to buy my 1st Vintage Amp
Posted: Sun Jan 29, 2017 11:37 am
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Thanks, I got lucky for sure on this one.
I'm gonna check for leaks and decide then. They look perfectly new, not a single bubble anywhere and no wax in the chassis.
I've got an alternate set of tubes for startup/testing, definitely don't wanna risk any of the date matched set.


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Post subject: Re: Trying to buy my 1st Vintage Amp
Posted: Sun Jan 29, 2017 5:05 pm
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Don't be fooled by the external looks of the caps. Waxed paper capacitors went out-of-common use for a reason.

https://antiqueradio.org/recap.htm


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Post subject: Re: Trying to buy my 1st Vintage Amp
Posted: Sun Jan 29, 2017 5:30 pm
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BMW2002Ti wrote:
Don't be fooled by the external looks of the caps. Waxed paper capacitors went out-of-common use for a reason.

https://antiqueradio.org/recap.htm


+1

They don't fare well where high ambient heat is common.

Arjay

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Post subject: Re: Trying to buy my 1st Vintage Amp
Posted: Wed Feb 01, 2017 9:50 am
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I will most likely replace them w/ Mallory 150's but I really want to hear the wax paper 1st to get a good tone comparison, as long as they aren't leaking DC.
Not looking to bust my budget anywhere on this one. The Red Jupiter's are a pretty close match to the tweed era tone.
Got the new F&T caps and the handle yesterday, waiting for the resistors.
Need to go by Lowe's and pick up the 9/64 nuts & bolts for the handle re-assembly.


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Post subject: Re: Trying to buy my 1st Vintage Amp
Posted: Wed Feb 01, 2017 9:59 am
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sfceric64 wrote:
Need to go by Lowe's and pick up the 9/64 nuts & bolts for the handle re-assembly.

Lowe's is going to sell you a pack when you only need a couple. If there's a mom & pop hardware store in your area, they will most likely sell you the 2 you need, for way cheaper. Happy hunting. :wink:

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Post subject: Re: Trying to buy my 1st Vintage Amp
Posted: Wed Feb 01, 2017 11:43 am
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sfceric64 wrote:
I will most likely replace them w/ Mallory 150's but I really want to hear the wax paper 1st to get a good tone comparison, as long as they aren't leaking DC.

Not looking to bust my budget anywhere on this one. The Red Jupiter's are a pretty close match to the tweed era tone.


IME, Mallory 150 are closer to later BF era tone. I'd stick with a good PIO (like Russian K40Y-9) or polypropylene ones designed for vintage tone. Jensen (Denmark) make some nice PIO caps. But, are even more $$$ than Jupiter Reds. For budget minded, nothing beats the Sprague SBE 600VDC 716P.

Those wax paper caps maybe leaky and give a tone to the amp that has a lot of distortion by overloading the signal grid with DC. It'll hard to match that tone.


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Post subject: Re: Trying to buy my 1st Vintage Amp
Posted: Wed Feb 01, 2017 2:13 pm
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I'd go with Jupiter Reds or Yellows. Both deliver a nice creamy tone.

Arjay

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Post subject: Re: Trying to buy my 1st Vintage Amp
Posted: Thu Feb 02, 2017 12:12 pm
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Quote:
Mallory 150 are closer to later BF era tone
Nothing wrong with that tone.

This is gonna be my experimental amp, its a fairly simple circuit. I plan on playing with it, a lot once I ensure it runs smoothly.
I've got .o22/.033/.047 in 716P, 150's, SoZo yel&blu and some generic oil caps to play with.


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Post subject: Re: Trying to buy my 1st Vintage Amp
Posted: Thu Feb 02, 2017 2:18 pm
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Those will definitely get you some blackface tones.

Arjay

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Post subject: Re: Trying to buy my 1st Vintage Amp
Posted: Thu Feb 09, 2017 11:03 pm
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Having some issues w/ my right arm, kinda hard to get to this project one handed. I have all the parts/pieces I think I might need, maybe by next week I'll get my right hand back. The only new work I've done is, I added epoxy over the old cap can fiber for prevention/protection and to seal them. Removed the protruding connector ends 1st but kept the grounding lugs of each can.

Question: Any issue w/ replacement electrolytic orientation, maybe 45 degrees as there is not enough room
to lay them horizontal to the chassis?

Quote:
Lowe's is going to sell you a pack when you only need a couple
mom/pop joints are really scarce these days. I found what I needed at Lowe's, cost me $2.50 for an 8 pack of 3/16" x 3/4" nuts/bolts and a bag of #6 washers and now I have a set of 4 for the next time I need something this small.

Oh yeah trying to keep the tax man happy as well; should have that wrapped up this weekend.


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Post subject: Re: Trying to buy my 1st Vintage Amp
Posted: Fri Feb 10, 2017 9:05 am
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For this new amp project you should start a new thread.

:idea:

Arjay

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Post subject: Re: Trying to buy my 1st Vintage Amp
Posted: Fri Feb 10, 2017 10:35 am
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That's a good idea. Is it possible to move the posts from this thread to a new one? copy/paste and then delete.
Started new thread, working out the kinks(re-posting images to that thread).
How do I delete replies from this thread, says I am authorized but I don't see a delete option anywhere?

Would love it if the last entry from page 17 to here could be deleted.

OK, so now I see the delete option for the last post I have in the thread(this one). Does each original replying poster have to delete their respective message in order?

Edited w/ each attempt to transpose the related replies to the new topic.


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