Transcendent Sound Pinnacle 300b OTL Monoblock Amplifiers

A place for DIY project discussions.
Forum rules
1. No ad-hominem
2. No spamming or shilling
User avatar
Ali Tait
Posts: 272
Joined: Thu Jul 12, 2012 9:13 am

Transcendent Sound Pinnacle 300b OTL Monoblock Amplifiers

Unread post by Ali Tait » Sat Apr 13, 2019 10:50 am

Had this kit for quite a while, just not had the time up to now to get this done. Have finally made a start though.

I'm building these with a few mods, first of which are some very high quality regulated filament supplies- one for each 300b so eight in total, four in each monoblock. These are not part of the standard kit so I need to find room for them.

I've heard a similarly modified pair at a previous Owston which was easily the best amp I've heard so far, so if this kit gets anywhere near that I'll be a happy chappie.

First job is the filament supplies, got all the components laid out-

Image

Getting there-

Image

All done-

Image

Made a start on populating the chassis with tag strips etc-

Image

That's as far as I've got for now, will update the thread as I progress.

User avatar
wiicrackpot
Posts: 788
Joined: Fri Oct 04, 2013 7:49 pm
Location: Glasgow

Re: Transcendent Sound Pinnacle 300b OTL Monoblock Amplifiers

Unread post by wiicrackpot » Sat Apr 13, 2019 5:04 pm

This have the makings of a epic build, looking forward to reading your progress Ali. :ugeek:

That little pink door, is that for a mouse you trained up to tidy up after you?,
there was a piece on BBC News recently a chap didn't know who tidied up after him in his garage,
he rigged up a camera and found a mouse tidying the mess he'd left through the night. :lol:
Frank...made me do it.

User avatar
Ali Tait
Posts: 272
Joined: Thu Jul 12, 2012 9:13 am

Re: Transcendent Sound Pinnacle 300b OTL Monoblock Amplifiers

Unread post by Ali Tait » Sat Apr 13, 2019 9:14 pm

LOL yeah I saw that. The door is for the pixies to come in and sprinkle fairy dust over the build. :-)

User avatar
Ali Tait
Posts: 272
Joined: Thu Jul 12, 2012 9:13 am

Re: Transcendent Sound Pinnacle 300b OTL Monoblock Amplifiers

Unread post by Ali Tait » Thu May 02, 2019 7:31 pm

A bit more progress. Fitted the HT delay board from K&K Audio- this is not part of the supplied kit, but it will give the 300b's an easier life- eight 300b's are not cheap!

Image

Board built up-

Image

Installed into chassis-

Image


Heater wiring to the front end valves - these will be supplied from a winding on the toroids I'm having made-

Image

More progress-

Image

Getting there with the front end-

Image

User avatar
wiicrackpot
Posts: 788
Joined: Fri Oct 04, 2013 7:49 pm
Location: Glasgow

Re: Transcendent Sound Pinnacle 300b OTL Monoblock Amplifiers

Unread post by wiicrackpot » Thu May 02, 2019 7:44 pm

Great stuff Ali Tait, :clap: can you not substitute Type 45's valves for the 300b's?.
Frank...made me do it.

User avatar
Ali Tait
Posts: 272
Joined: Thu Jul 12, 2012 9:13 am

Re: Transcendent Sound Pinnacle 300b OTL Monoblock Amplifiers

Unread post by Ali Tait » Thu May 02, 2019 7:55 pm

Thanks. No swaps in this amp sadly. I do like a 45 though, great valve.

User avatar
Ali Tait
Posts: 272
Joined: Thu Jul 12, 2012 9:13 am

Re: Transcendent Sound Pinnacle 300b OTL Monoblock Amplifiers

Unread post by Ali Tait » Sat May 04, 2019 5:45 pm

Pretty much done now, or at least as far as I can go until I get the toroids Amethyst are making for me, then it's just a case of wiring up the filament supplies and Bob's yer mother's brother. Four filament supplies added, again not part of the original kit, but these will make a significant improvement to SQ-


Image


Image

User avatar
wiicrackpot
Posts: 788
Joined: Fri Oct 04, 2013 7:49 pm
Location: Glasgow

Re: Transcendent Sound Pinnacle 300b OTL Monoblock Amplifiers

Unread post by wiicrackpot » Sat May 04, 2019 8:00 pm

Nearly there , looking forward to you crossing the finishing line, :auto-car: :auto-checkeredflag:

I am a bit OCD, is that a cap at 1 o'clock position nearest to the black speaker terminal,
i'd be straightening that pronto, leaning a bit sideways would annoy me. :mrgreen:
Frank...made me do it.

User avatar
Ali Tait
Posts: 272
Joined: Thu Jul 12, 2012 9:13 am

Re: Transcendent Sound Pinnacle 300b OTL Monoblock Amplifiers

Unread post by Ali Tait » Sat May 04, 2019 8:28 pm

LOL yes annoys me too, but had to be like that, only way I could get it to fit.

User avatar
wiicrackpot
Posts: 788
Joined: Fri Oct 04, 2013 7:49 pm
Location: Glasgow

Re: Transcendent Sound Pinnacle 300b OTL Monoblock Amplifiers

Unread post by wiicrackpot » Sat May 04, 2019 8:35 pm

I see that from a closer look, it would foul the terminal, nevermind.

What have yo got in mind for first tune to christen it?,
since you have a Faery hatch, may i suggest something from ''Peatbog Faeries'' !!,
that'll get them dancing round scattering their faerie dust. :grin:
Frank...made me do it.

Post Reply