Search found 177 matches

by bostod
Fri Feb 09, 2024 2:58 pm
Forum: Valves
Topic: Valve amplifier service
Replies: 200
Views: 98819

Re: Valve amplifier service

So I have got the amp back home. Simon plugged in his phone as a source and the amp was quiet. I was keen to put the amp back in my setup but when I did the audible noise came straight back. God dam it. Tried swapping out tube pre to solid state, then passive. All produced the same hum. Put groundin...
by bostod
Sat Jan 27, 2024 10:45 am
Forum: Valves
Topic: Valve amplifier service
Replies: 200
Views: 98819

Re: Valve amplifier service

When Simon brought the amplifier round for a check, I was pleasantly surprised. As Simon said there is still some low level hum that is noticeable between tracks. I also agree that the hum is quieter. When the problem was at its worst the noise was more like a buzz or drone that increased with volum...
by bostod
Thu Oct 05, 2023 12:43 pm
Forum: Valves
Topic: Valve amplifier service
Replies: 200
Views: 98819

Re: Valve amplifier service

It has developed into way more than a simple service. Im thankful for all the advice so far and hopefully it will help others track down a similar fault in the future.
by bostod
Thu Jun 15, 2023 6:35 pm
Forum: Valves
Topic: Valve amplifier service
Replies: 200
Views: 98819

Re: Valve amplifier service

Looking to replace the AN capacitors for a reasonable price. Looking up on Google is a minefield. No one agrees and it appears the amp design matters alot. I like the look of the Arizona Blue pio. Mylar content which some suggest will ladt longer. Would this be a good (albeit much cheaper) alternati...
by bostod
Wed Apr 26, 2023 10:55 pm
Forum: Valves
Topic: Valve amplifier service
Replies: 200
Views: 98819

Re: Valve amplifier service

Thank you so much with all the help so far. I tried Simons advice and took out the PS audio Trio p-200 preamp and replaced it with a NVA passive preamp to test any additional ground issues going on. I was surprised that the noticeable hum changed into a much quieter buzz, if that makes sense. The no...
by bostod
Sun Apr 16, 2023 9:48 pm
Forum: CD
Topic: Op amps
Replies: 1
Views: 5738

Op amps

Am i right in thinking that upgrading the op amps in my cd player will make no difference if I use a coaxial output to a dac from the cd player
by bostod
Sat Apr 08, 2023 6:06 am
Forum: Valves
Topic: Valve amplifier service
Replies: 200
Views: 98819

Re: Valve amplifier service

Well mine currently has ecc83 in all 4 positions. Could that be the problem.
by bostod
Fri Apr 07, 2023 10:35 am
Forum: Valves
Topic: Valve amplifier service
Replies: 200
Views: 98819

Re: Valve amplifier service

Here is an update based on the above advice and my skill level, or lack of it. I have replaced all the valves both the small preamp and large power valves. This made no difference to the hum. To clarify the hum. When I switch on the amp it is very quiet. After about 15 seconds the hum gradually gets...
by bostod
Sat Apr 01, 2023 7:45 am
Forum: Valves
Topic: Valve amplifier service
Replies: 200
Views: 98819

Valve amplifier service

Hi guys. I have a world audio design 5881 valve amplifier that has developed a noticeable hum coming out of both speakers. Not noticeable when music is playing but very noticeable with no music or between tracks. I have no technical experience myself so I am looking for someone or a company to servi...
by bostod
Sun Aug 15, 2021 10:27 pm
Forum: Beginners
Topic: How can I tell if valves need replacing
Replies: 8
Views: 12180

Re: How can I tell if valves need replacing

Well after some hum getting louder over previous months, I replaced all the kt88 tubes. I did this because I read that old tubes can let transformer noise through. After inserting the new tubes, the amp is silent again. It was only after buying the new tubes that I noticed the silver tops on the old...
by bostod
Wed Jan 13, 2021 4:54 pm
Forum: Buying and Selling
Topic: Buffalo 3SE DAC
Replies: 5
Views: 4870

Re: Buffalo 3SE DAC

That is a beautiful dac. The description points to network only. Isn't there a coax, optical or USB input.
by bostod
Wed Jan 13, 2021 10:28 am
Forum: Beginners
Topic: How can I tell if valves need replacing
Replies: 8
Views: 12180

Re: How can I tell if valves need replacing

Thank you very much for the replies my amp id a WAD kit88 running in pentode mode I believe. The testing skill is way above what I am capable of but the visual clues are very helpful. The tubes look okay and after reinserted them the problem seems to be resolved. Other than upgrading the tubes, any ...
by bostod
Sun Jan 10, 2021 1:43 pm
Forum: Beginners
Topic: How can I tell if valves need replacing
Replies: 8
Views: 12180

How can I tell if valves need replacing

Hi guys. I need a little help please. I have a set of 4 Electro Harmonix KT88 valves. I noticed today a slight drop out on a song and slight bluring. Sounds almost like a small jump on vinyl. Could be my bluetooth receiver but the tubes are also getting on. Probably had 300hrs tops through them but ...
by bostod
Sat Oct 03, 2020 10:44 am
Forum: Buying and Selling
Topic: Wanted valve integrated amp around £500
Replies: 0
Views: 4031

Wanted valve integrated amp around £500

my Brother has heard my WAD KT88 and has fallen for the sound. He has a budget of around £500 and is looking to get a good second hand unit. Looking at the World audio designs stuff as it seems good value for money second had. Not limited to the KT88 and would consider others. The WAD 6550 also look...
by bostod
Thu Sep 10, 2020 6:57 pm
Forum: Speakers
Topic: Help with Bowers and Wilkins CDM7 speakers
Replies: 11
Views: 8732

Re: Help with Bowers and Wilkins CDM7 speakers

Thank you all. I was able to find some B&W drivers from ebay that were the same dimensions that are from the dm 601 series. Replaced the originals with 2 kevlar units. Sound is good enough to my ears. I cant tell a difference from the other original speaker. When testing the damaged drivers, the...