Oliver Sayes Amplifier Owners Club

StevenZ

Pending Gold Star Member
Hello how does it sound always wanted to try one?
It sounds very clean and balanced. He used Heyboer outputs on mine. It’s got a volume control but it’s not exactly an integrated. Needs an external preamplifier to perform best.
 
Thanks guys!

I believe the wood is spalted maple. It's a DHT driving DHT amp that can use either a 10y/26 to drive a 50/300B tube via a switch. Permalloy transformers used for input, interstage coupling, volume (AVC), and output. All the iron was wound by Dave Slagle save for the power transformer which I believe are by Lundahl. Pure silver wire was used for the signal path, AVC, and input transformers. The rest of the wiring is Duelund CAST SN/Cu.

All caps in signal path and power supply are either oil or film. The only electrolytic caps used are for the filament regulators, which I'm guessing are by Rod Coleman. Beefy power supply using 6ax4 dampers and 816 rectifiers. 4&8 ohm speaker taps and 2 headphone outs (high & medium Z).
 
Now tbis amp sounds like it would be amazing. Switchable type 50 to 300b. Awesome. Do you know the wpc on the type 50? As I understand type 50 are stunning. I will be interested to hear reports on this amp!

What speakers do you use?
 

kray

Site Supporter
Site Supporter
Wow. I’m jealous. My Oliver Sayes built passive pre uses the Elna 48 Slagle autoformer, into the Sayes 421a with UTC transformers and Duelund caps.
 
Now tbis amp sounds like it would be amazing. Switchable type 50 to 300b. Awesome. Do you know the wpc on the type 50? As I understand type 50 are stunning. I will be interested to hear reports on this amp!

What speakers do you use?
With this setup, the 50 should push just a little over 3W. I hear you can get upwards of 4 but you’d have to run them pretty hard.

Currently using the Omega 3 HO monitors but will prob upgrade when I recoup some funds.

Wow. I’m jealous. My Oliver Sayes built passive pre uses the Elna 48 Slagle autoformer, into the Sayes 421a with UTC transformers and Duelund caps.
Nice! How do like autoformers vs a traditional resistor pot?
 

kray

Site Supporter
Site Supporter
I believe when you have an amp that doesn’t need any gain for input the slagle autoformers are a great match. There seems to be more grunt and openess with the avc vs resistor volume.
 

paulbottlehead

Active Member
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The DHT driving a DHT will typically need some custom iron to get the gain up enough to function properly, or you pay a lot of money for some EML driver tubes. Your typical medium mu DHT will drive a 300B just fine if you have a 1:5 input transformer and a 1:2 interstage transformer, but your sources/preamp need to be happy driving that input transformer.
 

paulbottlehead

Active Member
Site Supporter
You can also go to three stages. A couple of small DHTs with a mu of 10 cascaded is plenty to drive a 300B. If you wanted to be really cheeky, you could use a pair of something like the 1H4 to drive a 300B, but have the filament of each 1H4 act as part of the cathode resistor for the 300B to get free DC heating.

Whether someone would like a two stage DHT amp loaded with lots of signal iron, or a two stage DHT amp with EML drivers, or an oddball three stage amp with minimal signal iron is rather hard to predict.
 
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