Den store Scandyna/Dynaco tråd ver. 2.0

[spuncut]

BTW nu vi snakker historie:

Bjørn Børjas (SEAS) erindring om Dynacohøjtalerne

Dynaco: When Børja came to SEAS, Dynaco was a very important customer. The firm was founded and was owned by David Hafler, producing Hi-Fi and Stereo Electronics, both kits and finished goods. The Dynaco products were very popular and were very often combined with speakers from Acoustic Research (AR), which was a specialized speaker manufacturer. At one point AR launched an amplifier, and thus broke an unwritten agreement between these two firms. Hafler responded by collaborating with SEAS on the development of a speaker which in the spirit of the company should be of high quality, at an affordable price. Hafler and Lian quickly arrived at a construction based on 25TV-EW and H087 in a 25 liter cabinet equipped with an acoustic valve which gave controlled bass and favorable impedance. The crossover was an RC network in front of the H087 tweeter, while the 25TV-EW had a built-in roll-off because of the heavy and high inductance 4-layer coil. Some extra resistors and a switch constituted a 5-position attenuator for treble regulation. The cabinet was solid and well dampened inside with stone wool. On the outside it was covered with real walnut veneer. The front grille was a frame covered with a light linen fabric (not unlike what AR used on their products). Børja seem to remember that a speaker would cost 80 USD over the counter. It was not long before the sale was well underway. And when the product received the tag "Best Buy" in Consumers Report, demand became enormous. Rumors said that the management of AR regretted that they had launched an amplifier, which ironically was practically a flop.
Kilde:
https://www.cfuttrup.com/history/bjorn_borja.html

Her er så den forstærker, som muligvis bærer skylden for at der blev taget initiativ til udvikling og produktion af Scandynaco A25.
https://www.stereophile.com/content/aco ... -amplifier
David Hafler havde tilsyneladende et ønske om at producere en højtaler der umærkeligt kunne glide ind og erstatte AR, det er i hvert fald en mulig forklaring på hvorfor Dynacohøjtalerne kom til at ligne AR's højtalere.

MVH Henning

[Fensten]

En af mine venner er blevet begavet med et sæt Dynaco højtalere.

Mit umiddelbare bud, var at det er M25X. Men de for store. Så jeg er på bar bund ift. hvilken model, der er tale om?

De har følgende mål.

Højde 65
Bredde 35
Dybde 14

De er stemplet made in denmark.


Jeg håber, at i kan hjælpe med at finde ud af hvilken model, der er tale om.



Mvh.


Fensten

[spuncut]

Hej Fensten
Det er sandsynligvis en tidlig udgave af den dobbeltkamrede A30 eller A35. Der blev også lavet sådan en tidlig (eller tilbudsmodel) af A45 der blot havde et firecifret nummer. Enhederne er tilsyneladende fra Peerless.
Det er nok mit bedste bud og god bagjul.
MVH Henning

[ScanDynacoNut]

Er der én som følger denne tråd, der kan afkode disse to parallelkoblede lytter. De har begge ens farvekoder?

Fundet i en A20. Den anden i sættet havde en 12uF kondensater i filtret.

[X-ray]

Sådan lige i hovedet...
Rød-rød-grøn = 22x100k = 2,2uF
Samlet er det så 4,4uF.

[ScanDynacoNut]

Sådan lige i hovedet...
Rød-rød-grøn = 22x100k = 2,2uF
Samlet er det så 4,4uF.

Tusind tak X-ray!!!
Jeg må lige udrede filteret og se hvorfor der er to så forskellige lytter i ellers identiske højttalere
Jeg antager at designet kan forklare forskellen…

[X-ray]

...og så kalder man ikke kondensatorer for 'lytter' - med mindre det er en elektrolyt-kondensator.(Elko)

X-ray

[ScanDynacoNut]

...og så kalder man ikke kondensatorer for 'lytter' - med mindre det er en elektrolyt-kondensator.(Elko)

X-ray

Så lærte jeg også noget i dag

[ScanDynacoNut]

Dynaco modeller og salgsargumenter…
Samme modeller solgt under ScanDyna navnet.