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Post subject: Re: Stromberg Carlson and EICO 666
Posted: Mon Oct 19, 2015 12:18 pm
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shimmilou wrote:
I have;

(GR)35...(PL)88...(S)4... otherwise the same. So, yours has a little different Plate voltage ("PL" and "S"), but for purposes of this tester, probably good enough for you to establish a baseline. I don't see the need for different settings for each half of the 12AX7 for the Plate and grid. My booklet is, "Addendum to 667-02 Roll Chart..."

My built in shows (GR)15, (PL)80 and (S)4. With the grid voltage set that low, the tube can now pull more current than it would if the grid was higher (35, 37, etc).


Thanks for your help I will try the setting from the Coletronics Tube Data for EICO 666 I will use a tube that is not my best and see what the reading are
thanks again
mud


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Post subject: Re: Stromberg Carlson and EICO 666
Posted: Mon Oct 19, 2015 1:21 pm
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Now on to the Stromberg.
First what do I clean the chaise with, do I spray some form of Deoxit in there and rag and Q tip out the dirt or is there another product for the dirt.
Some pictures from under the hood I would like to clean it some before I fire it up. Should I put new 6L6's in there turn it on and see what happens. What are the chances of the tubes failing if I do this. OR Should I clean it up and bring it to the tech that has my SFSR for evaluation before I fire it up
mud

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Post subject: Re: Stromberg Carlson and EICO 666
Posted: Mon Oct 19, 2015 9:10 pm
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Nice photos. No boards. True point-to-point.


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Post subject: Re: Stromberg Carlson and EICO 666
Posted: Tue Nov 17, 2015 8:56 am
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Well as I picked up my 69 super reverb, now with the black face mod, I dropped off the Stromberg Carson for evaluation before I fire it up and time will tell if it becomes a bass rig
mud


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Post subject: Re: Stromberg Carlson and EICO 666
Posted: Tue Nov 17, 2015 9:18 am
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If you want to use that Stromberg for bass use, you may need to re-do the PSU. Not sure those 5U4GB rectifiers will supply enough current for good bass. Several ppl I know that used old EICO and Dynaco amps for bass or big-room guitar work, went to solid-state 1N5408 or UF5408 sand diodes. Full wave bridge. And more mfd filtering. Like 100 to 200 mfd on the first filter stage. The 5U4GB can cause a noticeable change in bass response. It's really too much sag for bass use.

Mil spec 7581A in place of the 6L6GC. Be interesting, when you start to rebuild the S-C for bass.

Keep us posted! :D


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Post subject: Re: Stromberg Carlson and EICO 666
Posted: Tue Nov 17, 2015 9:21 am
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BMW2002Ti wrote:
If you want to use that Stromberg for bass use, you may need to re-do the PSU. Not sure those 5U4GB rectifiers will supply enough current for good bass. Several ppl I know that used old EICO and Dynaco amps for bass or big-room guitar work, went to solid-state 1N5408 or UF5408 sand diodes. Full wave bridge. And more mfd filtering. Like 100 to 200 mfd on the first filter stage. The 5U4GB can cause a noticeable change in bass response. It's really too much sag for bass use.

Mil spec 7581A in place of the 6L6GC. Be interesting, when you start to rebuild the S-C for bass.

Keep us posted! :D


Thanks for this info and will bring you up to date as it progresses
mud


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