It is currently Mon Mar 16, 2020 10:53 am

All times are UTC - 7 hours



Post new topic Reply to topic  [ 284 posts ]  Go to page Previous  1, 2, 3, 4, 5, 6, 7, 8 ... 19  Next
Go to page Previous  1, 2, 3, 4, 5, 6, 7, 8 ... 19  Next
Author Message
Post subject: Re: Trying to buy my 1st Vintage Amp
Posted: Wed Aug 10, 2016 9:53 pm
Offline
Professional Musician
Professional Musician

Joined: Tue Nov 27, 2012 6:56 am
Posts: 1677
Location: Coastal Bend, Tx.
Still waiting on a few pieces, until then just cleaning up a bit. If everything comes in I'll look to fire it up next week.
Thinking this amp spent some time in Japan; the pots and the 3-way plug are Japanese. Not that that's bad, but they aren't the original spec 1meg pots. I guess it really shouldn't matter as long as they work correctly, but what impact might they have, I'm not to familiar w/ pot values and there effects inside amps, is it basically the same thing as guitars?

Also have another question regarding axial lengths, when they are to short to reach where they need to be what is the consensus on soldering extensions? yes, no or get some that fit the width of the board
The previous owner took a shortcut w/ the V1 to ground resistor. The resistor axial is soldered to the second capacitor axial instead of the grommet. I assume this will alter the resistors value and throw off the voltage, hence my preceding question. Should I just clip it and add another 1" to the axial to get it to the grommet, since they are hard to find items.

Thanks, be patient I'll get it done.
Think of the story of the old bull and the young bull on the hillside.


Top
Profile
Fender Play Winter Sale 2020
Post subject: Re: Trying to buy my 1st Vintage Amp
Posted: Wed Aug 10, 2016 10:17 pm
Offline
Rock Star
Rock Star
User avatar

Joined: Sat Jul 03, 2010 2:18 pm
Posts: 6544
You mean radial leads, like in photo?

http://www.ebay.com/itm/5x-Panasonic-FC ... 1942149865

I'd replace radial lead components with proper axial lead ones.


Top
Profile
Post subject: Re: Trying to buy my 1st Vintage Amp
Posted: Wed Aug 10, 2016 10:46 pm
Offline
Professional Musician
Professional Musician

Joined: Tue Nov 27, 2012 6:56 am
Posts: 1677
Location: Coastal Bend, Tx.
No I'm talking about the 5meg CC grid to ground from V1. Somehow/way it was cut and soldered to the instrument cap going to tube 1 by the previous owner. But yeah either way axial/radial the lead needs to be extended by me to reach the intended grommet. yes, no, maybe ok to solder an extension? I'll put up a pic in the morning, its after midnight my time.


Top
Profile
Post subject: Re: Trying to buy my 1st Vintage Amp
Posted: Thu Aug 11, 2016 2:16 am
Offline
Rock Star
Rock Star
User avatar

Joined: Sat Jul 03, 2010 2:18 pm
Posts: 6544
Yeah, that is not correct. Sure extensions are fine. Use some shrink-wrap insulation, if shorting may be an issue.


Top
Profile
Post subject: Re: Trying to buy my 1st Vintage Amp
Posted: Thu Aug 11, 2016 5:04 pm
Offline
Professional Musician
Professional Musician

Joined: Tue Nov 27, 2012 6:56 am
Posts: 1677
Location: Coastal Bend, Tx.
Thanks, busy life day today. Here is a little blurry pic of the crap work I was talking about.
Image


Last edited by sfceric64 on Mon Jul 10, 2017 10:31 pm, edited 1 time in total.

Top
Profile
Post subject: Re: Trying to buy my 1st Vintage Amp
Posted: Thu Aug 11, 2016 6:00 pm
Offline
Rock Star
Rock Star
User avatar

Joined: Sat Jul 03, 2010 2:18 pm
Posts: 6544
You might want to redo all those crazy soldered links to proper one lead. The SANGAMO cap is not noted for being very good. May want to swap them out --- or, at the least, measure for DC leakage on the grid side.


Top
Profile
Post subject: Re: Trying to buy my 1st Vintage Amp
Posted: Thu Aug 11, 2016 6:30 pm
Offline
Professional Musician
Professional Musician

Joined: Tue Nov 27, 2012 6:56 am
Posts: 1677
Location: Coastal Bend, Tx.
Yeah that's the plan w/ the Sangamos, get it fired test for leakage and then go from there. Ideally I'll replace them all since they weren't factory stock, unfortunate thing when you buy sight unseen. I don't really have the extra cash this month to just replace everything. So as long as it runs ok, it'll have to play until I can get better replacements. It has given me more time to clean & polish while waiting for parts still. I've already pulled all the electrolytics and the dropping resistors so when I replace those, there should be some leftover axial lead to fix those two eyesores. My 30w iron hasn't got the wattage to fix the two or three other poor looking chassis grounds, so I may have to buy something w/ more heat.


Top
Profile
Post subject: Re: Trying to buy my 1st Vintage Amp
Posted: Thu Aug 11, 2016 6:45 pm
Offline
Rock Star
Rock Star
User avatar

Joined: Sat Jul 03, 2010 2:18 pm
Posts: 6544
Yeah, understand. Wholesale swap-outs sometimes get you further from final tone you desire. Then, you don't know which caps are the "problems."

IME, leaking caps affect the tone of the input stage (V1) and the phase inverter, the most. Luckily the 5B3 uses all 0.05mfd/600VDC coupling caps. So, the caps coming into and out of that 6SC7 (V1) are most critical.

http://ampwares.com/schematics/deluxe_5b3.pdf


Top
Profile
Post subject: Re: Trying to buy my 1st Vintage Amp
Posted: Thu Aug 18, 2016 12:31 pm
Offline
Professional Musician
Professional Musician

Joined: Tue Nov 27, 2012 6:56 am
Posts: 1677
Location: Coastal Bend, Tx.
Well, I decided to replace the pots, Sangamo caps and re-wire the OT before initial start up. So the last few things were ordered today(I hate writing checks on the 1st and them not hitting the bank until the 19th). The resistors that are right at 20-25% off spec will be the weak link; it took a while to find A-B 1w/2w replacements and I haven't ordered them yet, they are another $50. Most of them are gonna be lower than spec value slightly, but I guess that's the right side to err on as they all move higher w/ age.
So another week goes by, but better to get the things that would bother me out of the way now.
Wasn't able to mount a c12k into the dlx, so will just run a long spaghetti wire set to test with.
Nothing else going on.


Top
Profile
Post subject: Re: Trying to buy my 1st Vintage Amp
Posted: Thu Aug 18, 2016 12:51 pm
Offline
Rock Icon
Rock Icon
User avatar

Joined: Wed Mar 31, 2010 12:48 am
Posts: 26416
Location: Tombstone Territory
Aside from the iron, will there be anything left within the chassis that's original to the amp?

:lol:

Arjay

_________________
"Here's why reliability is job one: A great sounding amp that breaks down goes from being a favorite piece of gear to a useless piece of crap in less time than it takes to read this sentence." -- BRUCE ZINKY


Top
Profile
Post subject: Re: Trying to buy my 1st Vintage Amp
Posted: Thu Aug 18, 2016 6:36 pm
Offline
Rock Star
Rock Star
User avatar

Joined: Sat Jul 03, 2010 2:18 pm
Posts: 6544
sfceric64 wrote:
Well, I decided to replace the pots, Sangamo caps and re-wire the OT before initial start up. So the last few things were ordered today(I hate writing checks on the 1st and them not hitting the bank until the 19th). The resistors that are right at 20-25% off spec will be the weak link; it took a while to find A-B 1w/2w replacements and I haven't ordered them yet, they are another $50.

Nothing else going on.


If those are real Allen-Bradley resistors, in the ohm range used by most amps ---- get them. They are getting very hard to find. 220k-ohm, 33k-ohm, 1500 ohm, 1 meg, etc...


Top
Profile
Post subject: Re: Trying to buy my 1st Vintage Amp
Posted: Thu Aug 18, 2016 7:44 pm
Offline
Professional Musician
Professional Musician

Joined: Tue Nov 27, 2012 6:56 am
Posts: 1677
Location: Coastal Bend, Tx.
Quote:
Aside from the iron, will there be anything left within the chassis that's original to the amp?

Arjay, so far the only parts being replaced were all imo non-original. But after 65 years, I expected to replace somethings and so far it looks like there are the two dropping resistors plus 4 others that may be to far out of spec to perform. I'm hoping the domino cap and the two PIO that remain; one at the tone control and the other over the PI tube socket are good. I already have replacements for those if need be. All the tube sockets appear original, the wiring, jewel lamp, fuse and I believe the on/off-tone pot may be and all the knobs are original.
The iron and the speaker are of the era but may not be original and unfortunately there is no inked tape w/ one of the girls names on it.
I still feel fortunate to have gotten it for a decent price and hope it hasn't lost its unique character.

Quote:
If those are real Allen-Bradley resistors, in the ohm range used by most amps ---- get them. They are getting very hard to find. 220k-ohm, 33k-ohm, 1500 ohm, 1 meg, etc...
They appear to be and are priced as such, I will find out. There may be some with the military type markings as well though(an extra band).


Top
Profile
Post subject: Re: Trying to buy my 1st Vintage Amp
Posted: Fri Aug 19, 2016 1:40 am
Offline
Rock Star
Rock Star
User avatar

Joined: Sat Jul 03, 2010 2:18 pm
Posts: 6544
The extra band may mean the resistor is 1 or 2% tolerance (precise).

http://nearbus.net/wiki/index.php?title ... _codes.jpg


Top
Profile
Post subject: Re: Trying to buy my 1st Vintage Amp
Posted: Tue Aug 23, 2016 3:00 pm
Offline
Professional Musician
Professional Musician

Joined: Tue Nov 27, 2012 6:56 am
Posts: 1677
Location: Coastal Bend, Tx.
Anyone have experience w/ NewOldSounds in Arizona? Waiting on them to ship(UPS) the red jupitors, ordered last Thursday and sent them an email earlier this afternoon - no reply :roll: . Ordered some wire and pots from Angela's in Maryland same time, shipped through the USPS arrived yesterday.


Top
Profile
Post subject: Re: Trying to buy my 1st Vintage Amp
Posted: Tue Aug 23, 2016 3:06 pm
Offline
Rock Icon
Rock Icon
User avatar

Joined: Wed Mar 31, 2010 12:48 am
Posts: 26416
Location: Tombstone Territory
Steve at Angela's Instruments is pretty good about getting orders shipped in a timely manner.

As for NewOldSounds, I haven't got a clue.

Arjay

_________________
"Here's why reliability is job one: A great sounding amp that breaks down goes from being a favorite piece of gear to a useless piece of crap in less time than it takes to read this sentence." -- BRUCE ZINKY


Top
Profile
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 284 posts ]  Go to page Previous  1, 2, 3, 4, 5, 6, 7, 8 ... 19  Next
Go to page Previous  1, 2, 3, 4, 5, 6, 7, 8 ... 19  Next

All times are UTC - 7 hours

Fender Play Winter Sale 2020

Who is online

Users browsing this forum: No registered users and 2 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum

Search for:
Jump to: