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 Post subject: SIPP amplifier
PostPosted: 30 Oct 2017, 14:43 
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Joined: 04 Feb 2013, 06:52
Posts: 37
Location: North Wales
Am I right in thinking an EF86 in pentode mode will provide sufficient gain for a SIPP amplifier?
I intend to use EL34's in the output stage.
They are all readily available here in the UK.


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 Post subject: Re: SIPP amplifier
PostPosted: 31 Oct 2017, 20:57 
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Joined: 04 Jun 2008, 20:59
Posts: 3749
Location: Arizona, USA
Hi, If by SIPP you mean class A self inverting push-pull then the answer is yes. The El34s will need about +/- 30 volts of drive (depends on the B+ chosen). Since it is A1 mode and virtually no current is needed the EF86 should be fine. Depending on amount of gain you need it might be OK in triode mode as well.

Good listening
Bruce

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 Post subject: Re: SIPP amplifier
PostPosted: 01 Nov 2017, 17:14 
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Joined: 04 Feb 2013, 06:52
Posts: 37
Location: North Wales
I could try wiring the EF86 as a triode as there would be less distortion. If there was insufficient gain I could re-wire as a pentode on the same chassis and not need many extra components.


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 Post subject: Re: SIPP amplifier
PostPosted: 01 Nov 2017, 21:35 
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Joined: 08 Aug 2009, 03:11
Posts: 2225
Location: Chilliwack, BC
Never liked the topology without mega amounts of NFB. If zero NFB, a couple trioded stages may work better than a single pentode. You really have to try both for your listening tastes :D

Cheers!

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 Post subject: Re: SIPP amplifier
PostPosted: 02 Nov 2017, 03:41 
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Joined: 04 Feb 2013, 06:52
Posts: 37
Location: North Wales
It wouldn't be too hard to switch to a "nine pin" double triode such as a 5751, if the EF86 sounds poor.


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 Post subject: Re: SIPP amplifier
PostPosted: 02 Nov 2017, 21:55 
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Joined: 04 Jun 2008, 20:59
Posts: 3749
Location: Arizona, USA
Hi True on the 5751. I like them in SRPP stages. I find the NOS Philips ones really sweet sounding, for a brighter sound the Sovtek ones are good as well.

Good listening
Bruce

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