M3NTAL
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Thanks Eric,
I had thought the Koss was higher - something like 620-630v.
I had thought the Koss was higher - something like 620-630v.
eXStata DIY Electrostatic Amp for Intermediate DIYers
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ericj
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A few people have experimentally bumped up the bias voltage for the 950 but that's a dangerous game where you risk arcing and perforating the membrane.
manaox2
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Quote:
Yeah, thought 620V is what the ESP950 was designed for. 600V seems might be a good compromise, shouldn't be too much for pro Stax like later model Lambdas. The O2 seems like it can withstand quite a bit higher bias according to reports. 40V doesn't makes as big of a danger it seems on top of 580V like it would on 240V normal bias I would think. So I honestly don't think 620V is going to arc a pro Stax, but don't hold me responsible for what happens, so thats a YMMV. Unless you have a 950, no real reason to bump it higher anyway I feel.
| Originally Posted by ericj /img/forum/go_quote.gif A few people have experimentally bumped up the bias voltage for the 950 but that's a dangerous game where you risk arcing and perforating the membrane. |
Yeah, thought 620V is what the ESP950 was designed for. 600V seems might be a good compromise, shouldn't be too much for pro Stax like later model Lambdas. The O2 seems like it can withstand quite a bit higher bias according to reports. 40V doesn't makes as big of a danger it seems on top of 580V like it would on 240V normal bias I would think. So I honestly don't think 620V is going to arc a pro Stax, but don't hold me responsible for what happens, so thats a YMMV. Unless you have a 950, no real reason to bump it higher anyway I feel.
ericj
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Quote:
The manual that came with my 950 specifies 600v. Not saying it wasn't designed with 620v as a target, but if it was, i haven't seen anything to document it.
| Originally Posted by manaox2 /img/forum/go_quote.gif Yeah, thought 620V is what the ESP950 was designed for. 600V seems might be a good compromise, shouldn't be too much for pro Stax like later model Lambdas. The O2 seems like it can withstand quite a bit higher bias according to reports, I honestly don't think 620V is going to arc a pro Stax, but don't hold me responsible for what happens, so thats a YMMV. Unless you have a 950, no real reason to bump it higher anyway. |
The manual that came with my 950 specifies 600v. Not saying it wasn't designed with 620v as a target, but if it was, i haven't seen anything to document it.
Hottuna_
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Damn it took a long while to read all of this thread.
I am however pretty pumped to get a SS version up and running.
Fingers are getting twitchy already.... finished my balanced B22 in December... starting to see early signs of DIY addiction....
Anyway, I am up for PSU+SS amp boards whenever the next run occurs.
Want to give electrostats a go.
I am however pretty pumped to get a SS version up and running.
Fingers are getting twitchy already.... finished my balanced B22 in December... starting to see early signs of DIY addiction....
Anyway, I am up for PSU+SS amp boards whenever the next run occurs.
Want to give electrostats a go.
awpagan
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What is the "Stax" recommended bias voltage for the normal bias SR Lambda?
6 Pin plug version.
I think I remember reading somewhere 230v.
Gilmore says 280v
Anyone tried different bias voltages, and any thoughts?
6 Pin plug version.
I think I remember reading somewhere 230v.
Gilmore says 280v
Anyone tried different bias voltages, and any thoughts?
Michgelsen
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Normal bias is 230V.
ericj
Headphoneus Supremus
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Quote:
If gilmore said 280v it was a typo. normal bias are 230v.
If your bias is too low, the sensitivity drops and it doesn't sound right.
If your bias is too high, there is an increase in sensitivity and an increased risk of damage to the drivers.
So i have to recommend staying close to the designed bias voltages.
| Originally Posted by awpagan /img/forum/go_quote.gif What is the "Stax" recommended bias voltage for the normal bias SR Lambda? 6 Pin plug version. I think I remember reading somewhere 230v. Gilmore says 280v Anyone tried different bias voltages, and any thoughts? |
If gilmore said 280v it was a typo. normal bias are 230v.
If your bias is too low, the sensitivity drops and it doesn't sound right.
If your bias is too high, there is an increase in sensitivity and an increased risk of damage to the drivers.
So i have to recommend staying close to the designed bias voltages.
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Gents, one of the packages that went overseas has returned to me because of an addressing problem. The recipient has agreed that, since he can't readily get components, I can make these boards available to other builders.
There is one SS and one Hybrid board set with matched jfets. Same cost as before. Only new builders and only one board set per person.
Email me at alex@cavalliaudio.com
The first two emails win. But I ask that you buy these with intent to build and use the amp and not to just sell it off to someone else. You may wind up owning a collector's item.
There is one SS and one Hybrid board set with matched jfets. Same cost as before. Only new builders and only one board set per person.
Email me at alex@cavalliaudio.com
The first two emails win. But I ask that you buy these with intent to build and use the amp and not to just sell it off to someone else. You may wind up owning a collector's item.
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The hybrid is taken. Only the SS left.
M3NTAL
Headphoneus Supremus
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wow! Lucky SOB's
Postal_Blue
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Quote:
| Originally Posted by M3NTAL /img/forum/go_quote.gif wow! Lucky SOB's
|
pabbi1
Cavalli Audio Spiritual Advisor
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No more impressions for 6 weeks?
C'mon...
New source lands tomorrow or Monday, so I'll see if this scales up past the $2k level player to something more substantial.
C'mon...
New source lands tomorrow or Monday, so I'll see if this scales up past the $2k level player to something more substantial.
TimJo
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Quote:
Didn't know we had an impressions thread in the amp section. I'll certainly add some comments this weekend because I have really grown to love this amp...
Quote:
Wow, a limited edition amp driving limited edition stats... I'm feeling very lucky.
| Originally Posted by pabbi1 /img/forum/go_quote.gif No more impressions for 6 weeks? C'mon... |
Didn't know we had an impressions thread in the amp section. I'll certainly add some comments this weekend because I have really grown to love this amp...
Quote:
| Originally Posted by runeight /img/forum/go_quote.gif I ask that you buy these with intent to build and use the amp and not to just sell it off to someone else. You may wind up owning a collector's item.
|
Wow, a limited edition amp driving limited edition stats... I'm feeling very lucky.
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