[scompton]

863-MJE340G and 863-MJE350G are listed as the alternates in the BOM I have.

 

[n_maher]

Quote:

Originally Posted by scompton /img/forum/go_quote.gif 863-MJE340G and 863-MJE350G are listed as the alternates in the BOM I have.

Thanks for checking that, I didn't like seeing that the were different specs but perhaps they are inconsequential specs?

 

[runeight]

Yes, these versions are ok. I don't think there is any consequential change.

 

[runeight]

Quote:

Originally Posted by studeb /img/forum/go_quote.gif a brief update, i have grounded all the heatsinks, and the meter behaves, and there offsets are zeroed in now to hook it up

Good!! Let us know ...

 

[Lou Erickson]

Yay! My J271's came! I think all I still need is the pot, tubes, and a case. I'll have to double-check before I start putting it together. I can build the power supplies without the pots.

 

[studeb]

Holy smokin bass batman.

Lotsa bass with SRX-Mk3

almost too much

i will give a more serious review this weekend, but its waaay to late for me now

 

[spritzer]

Quote:

Originally Posted by Emooze /img/forum/go_quote.gif I noticed the instructions state that the DMM will pull the bias reading down? Well I left mine on there for a bit and it stayed right at 580. Should I check this before I hook up any headphones?

In many cases cheap DMM's will give you an incorrect reading when configuring bias supplies. The meters claim to be CAT II 1000v but they really aren't and thus can't handle the high impedance/voltage.

 

[Emooze]

Ah alright, thanks spritzer. I'll bring it over to the school lab at some point and use their meters.

 

[runeight]

I'm not sure that you really need to except to get a comfort level with the bias supplies. It seems to me that your readings are ok and I wouldn't let this stop you from playing some music.

 

[pabbi1]

So, if I happen to have 1n5369b (51v, 5w - and yes, the leads barely fit), can that sub in for the 1n4757a? And, if I happen to have a 47v, 1w (1n4756a), are we still trying to get closer to 150v total, so 2x 51v and 1x 47v ok, or better at 153v for the z3-5 and z6-8 strings, respectively?

oK, so Tanners was out of 1n4757a...

 

[spritzer]

If you go much above 600V then you will damage any of the Lambdas, Sigmas, 4070, Gammas and SR-003. Same probably applies to the SR-Omega but I'd never risk drivers which are worth their weight in gold (probably more) with anything but 580V. The HE90 and HE60 will also be damaged soon after 600V since since you are already pushing them at 580V. The SR-007 can take 800V without complaining but it's not something I'd recommend.

 

[runeight]

Quote:

Originally Posted by pabbi1 /img/forum/go_quote.gif So, if I happen to have 1n5369b (51v, 5w - and yes, the leads barely fit), can that sub in for the 1n4757a? And, if I happen to have a 47v, 1w (1n4756a), are we still trying to get closer to 150v total, so 2x 51v and 1x 47v ok, or better at 153v for the z3-5 and z6-8 strings, respectively? oK, so Tanners was out of 1n4757a...

Yes, this will be ok.

 

[runeight]

Quote:

Originally Posted by spritzer /img/forum/go_quote.gif If you go much above 600V then you will damage any of the Lambdas, Sigmas, 4070, Gammas and SR-003. Same probably applies to the SR-Omega but I'd never risk drivers which are worth their weight in gold (probably more) with anything but 580V. The HE90 and HE60 will also be damaged soon after 600V since since you are already pushing them at 580V. The SR-007 can take 800V without complaining but it's not something I'd recommend.

Thanks for this info.

 

[BoilermakerFan]

Quote:

Originally Posted by spritzer /img/forum/go_quote.gif If you go much above 600V then you will damage any of the Lambdas, Sigmas, 4070, Gammas and SR-003. Same probably applies to the SR-Omega but I'd never risk drivers which are worth their weight in gold (probably more) with anything but 580V. The HE90 and HE60 will also be damaged soon after 600V since since you are already pushing them at 580V. The SR-007 can take 800V without complaining but it's not something I'd recommend.

What are the HE60s rated for? I do NOT want to blow Tachi's drivers via ignorance.

 

[Beefy]

Quote:

Originally Posted by BoilermakerFan /img/forum/go_quote.gif What are the HE60s rated for? I do NOT want to blow Tachi's drivers via ignorance.

Google says 540V.