Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: joesatch on July 29, 2022, 12:12:29 pm

Title: F&T variants
Post by: joesatch on July 29, 2022, 12:12:29 pm: Bought several F&T 22uf 500v caps from a few vendors. There are differences in size on these. Why? Which is better?
Title: Re: F&T variants
Post by: shooter on July 29, 2022, 12:35:04 pm: :laugh:
open them up, probably lots of air inside.
whatever can was on sale the day they decided to make 22uF cap determined the can size
Title: Re: F&T variants
Post by: sluckey on July 29, 2022, 12:35:33 pm: The big ones are for big amps. The little ones are for little amps.
Title: Re: F&T variants
Post by: dude on July 29, 2022, 01:27:52 pm: Ease of manufacturing, use what fits, all kidding aside but l like “use the big ones for big amps, small one for same amps” :laugh:
Title: Two sizes listed in their catalog
Post by: chaswahl on July 29, 2022, 06:56:51 pm: FWIW, their full range catalog does list two different sizes for 22 uF 500 V Typ A caps: 16 x 39 mm and 18 x 30 mm, the only apparent difference being the "order code": https://www.ftcap.de/fileadmin/user_upload/download_inhalte/FTCap_ELCO_mit_Mersenlogo_Ansicht.pdf

They have a "general section" at the beginning that is interesting for its informational content.
Title: Re: F&T variants
Post by: bmccowan on July 29, 2022, 07:23:24 pm: this chart explains it well
Title: Re: F&T variants
Post by: owen on July 30, 2022, 12:04:35 am: Wasn’t F&T bought by Mersen a few years back, or is that bad info?
Title: Re: F&T variants
Post by: DummyLoad on July 30, 2022, 01:46:46 am: Quote from: owen on July 30, 2022, 12:04:35 am
Wasn’t F&T bought by Mersen a few years back, or is that bad info?

Yes, they were.

https://www.ftcap.de/en/

--Pete
Title: Re: F&T variants
Post by: HotBluePlates on July 30, 2022, 06:50:04 am: Quote from: joesatch on July 29, 2022, 12:12:29 pm
... There are differences in size on these. Why? ...

It doesn't matter. The size is very-similar.

Quote from: joesatch on July 29, 2022, 12:12:29 pm
... Which is better?

They're the same. Use them in good health!
Title: Re: F&T variants
Post by: thetragichero on July 30, 2022, 08:34:34 am: Quote from: joesatch on July 29, 2022, 12:12:29 pm
Bought several F&T 22uf 500v caps from a few vendors. There are differences in size on these. Why? Which is better?

this is the same thing as when you go to mouser and search for a 100nf 50v film cap (for example). you'll get results rangi-shapeng in size from smaller than a grain of rice to quite large. differently-shaped pegs for differently-shaped holes
Title: Re: F&T variants
Post by: EL34 on July 30, 2022, 09:02:12 am: My FT supplier orders directly from FT in Germany

I had him get me 500 of the 16/475v caps from FT in Germany

The top longer 22/500v cap in your photo is what I stock and comes directly from Germany
Not sure what that shorter fat one is?

All my FT caps are on this page
https://hoffmanamps.com/MyStore/catalog/Capacitors.htm
Title: Re: F&T variants
Post by: joesatch on July 30, 2022, 10:27:42 am: i went with the big ones.
Title: Re: F&T variants
Post by: Williamblake on July 30, 2022, 10:31:10 am: I wish they had a variant with sturdy lettering.
Title: Re: F&T variants
Post by: owen on July 31, 2022, 11:18:14 pm: Quote from: Williamblake on July 30, 2022, 10:31:10 am
I wish they had a variant with sturdy lettering.

I was embarrassed by how badly the print disappeared off them in an amp I built a friend that I replaced the caps wearing gloves… I want any actual techs working on it to quickly read all values.
Title: Re: F&T variants
Post by: uki on August 01, 2022, 04:32:38 pm: Is that the cool chassis you were talking about the other day? Looks good so far!