Are the H1809 & H1812 HV Diodes compatible?

Bullwinkle

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I'm a bit confused (probably because I have a datasheet for the H1812, but can't find one for the H1809). The manual for the v2000 shows H1809, can't figure out what the G05 manual recommends as it only shows their part number. The datasheet I have on the H1812 is the one titled "Electrohome G05 HV Diode Datasheet" so can I assume that H1812 is the correct one for the G05-802?

I've seen in previous posts that DarrinF has used H1809s in both G05-802s and v2000s with no issues... thus the title of this thread. Reason being, I'm simply trying determine if I can use a replacement hv diode that I picked up locally. It's a direct replacement for the H1812, I've used it in the past though it's a much larger diode physically, it works as a replacement.. just wondering if I can use that to replace the 1809 currently in my blooming v2000.

Thanks in advance. Also, if anyone knows where I can get a spec sheet on the H1809, that would be much appreciated too.

Thanks
 
I know the H1812 by VARO is rated at 20kV. I thought the H1809 was rated higher, like 30kV or so. Someone on here can correct me.
 
OK, so the 1812 datasheet linked below confirms the 20kVDC . If the rating for the 1809 is 30kVDC, would all other specs be = or slightly higher?

http://www.arcade-museum.com/manuals-monitors/Electrohome G05_HV_Diode_Datasheet.pdf

DarrenF, I've seen that as well and will probably order from there.. just trying to iron out the specs as someone also mentioned (JimK I believe) that they used an NTE 505 and it worked (but also mentioned it had a slight blooming issue)
 
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I recently fixed an Asteroids Deluxe monitor that had blooming AFTER i replaced the diode, and I eventually tracked it to bad solder on the big connector on the deflection board.


BTW - when is someone going to design a new flyback for these damn -802's and V2000's that doesn't require the HV diode? They are such a pain to replace...
 
I recently fixed an Asteroids Deluxe monitor that had blooming AFTER i replaced the diode, and I eventually tracked it to bad solder on the big connector on the deflection board.


BTW - when is someone going to design a new flyback for these damn -802's and V2000's that doesn't require the HV diode? They are such a pain to replace...

I hear that. Last time I worked on a cocktail AD, I broke the leg off a brand new one as I had to solder the ends where the spring was missing. I decided to order 2 more just in case I did it again!... thankfully the next one went in without any breaks.

I ordered 2 NTE 505s. Going to give them a shot as they do have the higher voltage rating
 
- when is someone going to design a new flyback for these damn -802's and V2000's that doesn't require the HV diode? They are such a pain to replace...

A transformer produces AC, and the CRT needs DC. AFAIK, all FBTs (vector, raster, color, B&W...) have such HV diodes. They're just typically built in to the FBT package.

Would you rather replace a whole FBT than an HV diode?
 
A transformer produces AC, and the CRT needs DC. AFAIK, all FBTs (vector, raster, color, B&W...) have such HV diodes. They're just typically built in to the FBT package.

Would you rather replace a whole FBT than an HV diode?

I would rather someone design a new reliable FBT that won't fail so I can replace it rather than the diode. Considering the diodes aren't that cheap, and the legs break easily (and I've also had new ones break), I'd rather spend another $10-20 and just replace the flyback and be done with it forever...
 
I ordered 2 NTE 505s. Going to give them a shot as they do have the higher voltage rating

Please let us know how the NTE505 works out. Looks like those go for about $6 at Mouser.

I looked at the datasheet and compared to the old Varo datasheet. The only that that I'm not sure about is the speed of the diode. The NTE datasheet doesn't provide a "recovery time" but a "typical forward delay time." Not sure if that's the same thing or not. Hopefully the NTE part will be up to the 25-30kHz operation it'll see...
 
Please let us know how the NTE505 works out. Looks like those go for about $6 at Mouser.

I looked at the datasheet and compared to the old Varo datasheet. The only that that I'm not sure about is the speed of the diode. The NTE datasheet doesn't provide a "recovery time" but a "typical forward delay time." Not sure if that's the same thing or not. Hopefully the NTE part will be up to the 25-30kHz operation it'll see...
.

yeah, I went to a local distributor who's good at matching specs and he felt it was a viable replacement. Paid $7 each, but no shipping. I will let you know how they work out.
 
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