Threshold FET ONE Series II aka FET1 MKII

megasat16 · 1st April 2010, 05:40 AM

Got one of the vintage Threshold pre. It's oldie but sounds very yummy. While I don't use it that much, I think it's the keeper till I kick the bucket.

The question is should I recap the FET1? It sounds good as is but it's probably about time for proper recapping and upgrading. I think it's time for at least two big filter electrolytic caps to get a retirement.

I don't have any manual or schema for it but it's not hard to do recapping. While I do recapping, what parts should be upgraded too?

Thanks,
James

analog_sa · 1st April 2010, 07:58 AM

Filter caps for sure. I would also replace all those 10uF polyesters with something cheap like Auricaps. Going overboard is probably not worth it - too many pots and old switches to make it truly transparent.

BrianEno · 7th May 2010, 03:20 PM

I'm also interested in this preamp.
I know the original fet one uses transformers for the MC amplification and the Series II a MC headamp.
Is anybody aware of other differences between the two?
Had this preamp myself 23 years ago but traded it in for a Levinson ML-7A.
Found this Japanes refurbishing link for the "Series I":
Threshold FET1

Greetings

Nelson Pass · 7th May 2010, 03:51 PM

Don't you just love those guys.

BrianEno · 7th May 2010, 04:11 PM

Well they certainly cherished your products from that era!
I'm only wondering why they removed the grease (green stuff) from the Noble pots. Who did principal designing for these preamps (Fet One & Two) Eric Lauchli or you?

Nelson Pass · 7th May 2010, 09:05 PM

Me, but Eric helped so I gave him a credit.

BrianEno · 8th May 2010, 07:22 AM

Okay that's sorted out now. Very generously of you that he could print his name also on the circuit board.
Can you recall why you switched from the Jensen transformers in Series I to the MC headamp in Series II?
Won't bother you any further about this subject.

1st April 2010, 05:40 AM	#1
megasat16 diyAudio Member Join Date: Mar 2009	Threshold FET ONE Series II aka FET1 MKII Got one of the vintage Threshold pre. It's oldie but sounds very yummy. While I don't use it that much, I think it's the keeper till I kick the bucket. The question is should I recap the FET1? It sounds good as is but it's probably about time for proper recapping and upgrading. I think it's time for at least two big filter electrolytic caps to get a retirement. I don't have any manual or schema for it but it's not hard to do recapping. While I do recapping, what parts should be upgraded too? Thanks, James

7th May 2010, 03:20 PM	#3
BrianEno diyAudio Member Join Date: Jul 2007	Threshold Fet one series II I'm also interested in this preamp. I know the original fet one uses transformers for the MC amplification and the Series II a MC headamp. Is anybody aware of other differences between the two? Had this preamp myself 23 years ago but traded it in for a Levinson ML-7A. Found this Japanes refurbishing link for the "Series I": Threshold FET1 Greetings

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1st April 2010, 07:58 AM	#2
analog_sa diyAudio Member Join Date: Aug 2002 Location: Sofia	Filter caps for sure. I would also replace all those 10uF polyesters with something cheap like Auricaps. Going overboard is probably not worth it - too many pots and old switches to make it truly transparent.

7th May 2010, 03:51 PM	#4
Nelson Pass The one and only Join Date: Mar 2001	Don't you just love those guys.

7th May 2010, 04:11 PM	#5
BrianEno diyAudio Member Join Date: Jul 2007	Well they certainly cherished your products from that era! I'm only wondering why they removed the grease (green stuff) from the Noble pots. Who did principal designing for these preamps (Fet One & Two) Eric Lauchli or you?

7th May 2010, 09:05 PM	#6
Nelson Pass The one and only Join Date: Mar 2001	Me, but Eric helped so I gave him a credit.

8th May 2010, 07:22 AM	#7
BrianEno diyAudio Member Join Date: Jul 2007	Okay that's sorted out now. Very generously of you that he could print his name also on the circuit board. Can you recall why you switched from the Jensen transformers in Series I to the MC headamp in Series II? Won't bother you any further about this subject.

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