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Post subject: Re: 6G2 Princeton with white knobs
Posted: Tue Oct 23, 2012 6:51 pm
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It might pay to check the idle bias to ensure that it's within the parameters of the schematic. You'll need to know the plate voltage as well.

HTH

Arjay

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Post subject: Re: 6G2 Princeton with white knobs
Posted: Mon Jul 08, 2013 10:35 am
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Nice Amp I have one just like it, Im 61 and have had it since new. the faceplate on my amp is scratched near the input but grill cloth is in super condition. You should remove the death cap and install a 3 prong plug for safety,other than that keep it stock. Thanks for the post


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Post subject: Re: 6G2 Princeton with white knobs
Posted: Mon Jul 08, 2013 11:21 am
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mad tuner wrote:
Nice Amp I have one just like it, Im 61 and have had it since new. the faceplate on my amp is scratched near the input but grill cloth is in super condition. You should remove the death cap and install a 3 prong plug for safety,other than that keep it stock. Thanks for the post


+1

As well, the cap can and power-rail resistors should be inspected regularly for signs of geriatric issues.

Arjay

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Post subject: Re: 6G2 Princeton with white knobs
Posted: Mon Sep 23, 2013 10:45 am
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s3mamill wrote:
I got the amp in the mail today; Haven't actually played it yet. It was packed really well, and externally its what was pictured. Haven't pulled the chassis yet.

Couple of things are a little annoying though. It was photoed with an old set of sylvania tubes, but came with new russian tung-sol 6v6's and a GT 5ar4 rectifier, which isn't the correct one. I have a 5y3, but its still dumb that they didn't include the specified tube.

It came with a middle of the line alnico sig10s weber, and the guy threw in a c10q in need of a recone. The jensen is pretty rusty though. Nothing seems rusted through...do you guys think its worth it to recone this old thing?

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Did he ever tell you which speaker was being used in that video? The Jensen, Oxford, or he Weber? Whatever it was it sounds pretty nice.


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Post subject: Re: 6G2 Princeton with white knobs
Posted: Tue Sep 24, 2013 8:08 pm
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The Jensen C10Q dates to the 51st week of 1965. Were it mine, I'd have it re-coned. With a new coil, cone, and suspension assembly it'd be ideal for any amp in the Princeton family.

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Post subject: Re: 6G2 Princeton with white knobs
Posted: Tue Sep 24, 2013 9:45 pm
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s3mamill wrote:
Here is a vid he sent me. I like the tone

http://www.youtube.com/watch?v=JbawqZ6L ... e=youtu.be



Geez, this little amp sounds huge, especially in the cranked-up mode.

:shock:


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Post subject: Re: 6G2 Princeton with white knobs
Posted: Tue Sep 24, 2013 10:24 pm
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Retroverbial wrote:
The Jensen C10Q dates to the 51st week of 1965. Were it mine, I'd have it re-coned. With a new coil, cone, and suspension assembly it'd be ideal for any amp in the Princeton family.

Arjay


Sorry Arjay - I didn't mean to repost the pics of that speaker in my quote (newbie mistake). I was asking if he ever found out what speaker was in the amp in the YouTube video, it sounds great. I have a transitional '64 6G2 just like it, and I put a brand new Jensen P10R in it. It doesn't have quite the same breakup characteristic as the one in the video. In the clip, it seems like it's mostly the amp that's clipping - squaring the wave. With mine, sounds like it is coming from the speaker quite a bit - not as tight. Even with the volume at 6, it already seems like too much for the speaker. Can't imagine mine would sound as good as the video if I dimed it. Could it be that it's not broken in enough? I have maybe an hour on it right now. Or is it not maybe able to handle the power of my amp at the volumes at which it distorts?

Thanks,

Ryan


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Post subject: Re: 6G2 Princeton with white knobs
Posted: Tue Sep 24, 2013 10:50 pm
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The "R" coil was originally designed to 20-watt specs (the "Q" to 25). Yours may need more break-in time but it also possible you're hearing breakup, perhaps prematurely.

Arjay

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Post subject: Re: 6G2 Princeton with white knobs
Posted: Sun Oct 20, 2013 12:54 am
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The limits of my electrical knowledge and understanding will doubtless be made apparent by my question, but here goes anyway. I recently dug my '62, 6G2 Princeton out of deep storage, not having played it in nearly 15 years. It's all original and I'd like to keep that way as much as possible, but I also want to be able to play it without risking death. I've only just learned about the danger associated with the 2-prong plug and the ground switch cap. As an alternative to the death cap / 3-prong cord mod, would the introduction of a fuse between the cap and the transformer mounting screw afford the desired protection by preventing it from shorting to the chassis? If so, the amp can be used safely, and should the need or desire ever arise the less invasive surgery could easily be reversed to preserve the amp's vintage.


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Post subject: Re: 6G2 Princeton with white knobs
Posted: Sun Oct 20, 2013 1:08 am
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MrPaulCaruso wrote:
The limits of my electrical knowledge and understanding will doubtless be made apparent by my question, but here goes anyway. I recently dug my '62, 6G2 Princeton out of deep storage, not having played it in nearly 15 years. It's all original and I'd like to keep that way as much as possible, but I also want to be able to play it without risking death. I've only just learned about the danger associated with the 2-prong plug and the ground switch cap. As an alternative to the death cap / 3-prong cord mod, would the introduction of a fuse between the cap and the transformer mounting screw afford the desired protection by preventing it from shorting to the chassis? If so, the amp can be used safely, and should the need or desire ever arise the less invasive surgery could easily be reversed to preserve the amp's vintage.


No.

If you want to play the amp, fix it so that the amp is safely playable. Replace the old cable with a properly grounded three-prong cable and remove the death cap. Your proposed solution is not a solution. Depending on which way the old plug is inserted into the socket or the way the ground switch is thrown can cause the chassis to be "hot" and has nothing to do with anything shorting out.

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Post subject: Re: 6G2 Princeton with white knobs
Posted: Sun Oct 20, 2013 1:16 am
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bluesky636 wrote:
MrPaulCaruso wrote:
The limits of my electrical knowledge and understanding will doubtless be made apparent by my question, but here goes anyway. I recently dug my '62, 6G2 Princeton out of deep storage, not having played it in nearly 15 years. It's all original and I'd like to keep that way as much as possible, but I also want to be able to play it without risking death. I've only just learned about the danger associated with the 2-prong plug and the ground switch cap. As an alternative to the death cap / 3-prong cord mod, would the introduction of a fuse between the cap and the transformer mounting screw afford the desired protection by preventing it from shorting to the chassis? If so, the amp can be used safely, and should the need or desire ever arise the less invasive surgery could easily be reversed to preserve the amp's vintage.


No.

If you want to play the amp, fix it so that the amp is safely playable. Replace the old cable with a properly grounded three-prong cable and remove the death cap. Your proposed solution is not a solution. Depending on which way the old plug is inserted into the socket or the way the ground switch is thrown can cause the chassis to be "hot" and has nothing to do with anything shorting out.


+1

You'll spend less time and money by simply disabling the death cap and installing a grounded 3-conductor power cable.

Do it right or pay someone to do it right......scrimping on safety issues is a fool's errand.

Arjay

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Post subject: Re: 6G2 Princeton with white knobs
Posted: Sun Oct 20, 2013 1:49 am
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Thanks fellow insomniacs for the (unbelievably!) quick response and the good advice. I'll move forward accordingly.


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Post subject: Re: 6G2 Princeton with white knobs
Posted: Sun Oct 20, 2013 1:54 am
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If, as you assert, the amp has sat idle for fifteen years it's likely due for a filter-cap replacement. That's the large silver cylinder hanging vertically from the bottom of the chassis. The associated power-rail resistors should also be inspected and, if deemed to be out of spec, replaced as well.

Arjay

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Post subject: Re: 6G2 Princeton with white knobs
Posted: Sun Oct 20, 2013 3:36 am
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Yeah, I did fire it up briefly before tearing it down for cleaning and noticed a tremolo tick which it never had before. That pretty much convinced me a service visit was in the amp's immediate future, the advice re the cap/cord issue was the topper.

I must admit though, I miss the powering up ritual of checking grounding by tapping the mic - in the old days it was great fun to see who got the biggest jolt - and truth is I always liked that bit of tingle just before the first song...felt like a jump start.


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Post subject: Re: 6G2 Princeton with white knobs
Posted: Sun Oct 20, 2013 8:22 am
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MrPaulCaruso wrote:
I must admit though, I miss the powering up ritual of checking grounding by tapping the mic - in the old days it was great fun to see who got the biggest jolt - and truth is I always liked that bit of tingle just before the first song...felt like a jump start.


That "ritual" nearly got Keith Richards electrocuted in December of '65 at the Sacramento Municipal Auditorium.

I was there and it wasn't pretty......

:(

Arjay

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