Print Page - Original Blue Box Transistors?

Title: Original Blue Box Transistors?
Post by: peps1 on August 12, 2011, 10:53:52 PM

Any one know the original transistors used in the older two single op-amps Blue Box?

Title: Re: Original Blue Box Transistors?
Post by: boogietone on August 13, 2011, 12:56:41 AM

Not sure how old mine is. I will check tomorrow.

Title: Re: Original Blue Box Transistors?
Post by: Mark Hammer on August 13, 2011, 12:00:00 PM

2SC1849

Title: Re: Original Blue Box Transistors?
Post by: peps1 on August 13, 2011, 11:13:29 PM

Thanks Mark, and that defiantly the twin op-amp blue box?

Title: Re: Original Blue Box Transistors?
Post by: Mark Hammer on August 14, 2011, 10:02:32 AM

It's the factory schem and shows a pair of dual op-amps. I doubt whether use of those trannies will improve performance. The Bluebox is a little "underdesigned". If you're thinking that using the 1849s will improve tracking, I think you're barking up the wrong tree.

Title: Re: Original Blue Box Transistors?
Post by: peps1 on August 14, 2011, 03:55:57 PM

:icon_biggrin: dual op-amps or two single op-amps (LM741CN)?

Just after the info for my own records, nothing to do with tightening up the tracking....... Best way to improve the tracking on a Blue Box is buy buying another pedal with just one octave down! ;)

Title: Re: Original Blue Box Transistors?
Post by: Mark Hammer on August 14, 2011, 08:20:20 PM

Ooops :icon_redface: You're right. Two chips, but only one of them is a dual op-amp. However, looking at the MXR factory schem for the issue that used two individual 741 op-amps, it still shows 2SC1849, so you're safe.

Title: Re: Original Blue Box Transistors?
Post by: peps1 on September 09, 2011, 10:32:13 PM

Thanks for double checking that one for me, really appreciated!

DIYstompboxes.com

DIY Stompboxes => Building your own stompbox => Topic started by: peps1 on August 12, 2011, 10:53:52 PM